Explanation:
Increased pollution is a possible negative aspect of economic growth
A cross-section of a 500V (All Aluminum Conductor) Triplex cable, which is used for single-phase 116/230 V secondary overhead service drops to customers. The phase as well as the neutral conductors are 2/0 Aluminum. Outside diameter of all the conductors is 0.357 inch and the diameter of phase conductors with jacket is 0.477 inch. GMR of conductors is 0.0111 ft and resistance of conductors is 0.1837 Ω/1000 ft. 1) Find the 3x3 impedance matrix of a 150 ft long cable for the phase and neutral conductors. Remove the neutral using Kron's reduction to determine 2x2 matrix.
The 2x2 impedance matrix for the phase conductors is:
Z_phases = [0.4410+j0.1559 -j0.0562; -j0.0562
What is the 3x3 impedance matrix of a 150ft long cable for phase and neutral conductorsTo find the impedance matrix, we first need to calculate the self-impedance and mutual impedance of the conductors. We can use the following formulas:
Self-impedance of a conductor:
Z_self = R + jX
where R is the resistance and X is the inductive reactance given by:
X = 2πfGMR
Mutual impedance between two conductors:
Z_mutual = jX_mutual
where X_mutual is given by:
X_mutual = 2πfGMD
where f is the frequency (assumed to be 60 Hz), GMR is the geometric mean radius, and GMD is the geometric mean distance between the conductors.
Given that the phase and neutral conductors are identical, we can calculate the self-impedance and mutual impedance for one conductor and multiply by 2 for the phase conductors and by 1 for the neutral conductor. Therefore, we have:
Self-impedance of one conductor:
Z_self = 0.1837 Ω/1000 ft + j(2π60 Hz0.0111 ft) = 0.1837 + j0.0418 Ω
Mutual impedance between phase conductors:
Z_mutual = j(2π60 Hz0.1418 ft) = j0.0531 Ω
Mutual impedance between phase and neutral conductors:
Z_mutual = j(2π60 Hz0.1777 ft) = j0.0669 Ω
Now, we can assemble the impedance matrix:
Z11 = Z22 = 2*Z_self + Z_mutual = 0.4637 + j0.1369 Ω
Z12 = Z21 = -Z_mutual = -j0.0531 Ω
Z13 = Z31 = -Z_mutual/2 = -j0.0335 Ω
Z23 = Z32 = -Z_mutual/2 = -j0.0335 Ω
Z33 = Z_self = 0.1837 + j0.0418 Ω
To remove the neutral conductor using Kron's reduction, we need to calculate the equivalent impedance seen by the phase conductors when the neutral is removed. We can do this by short-circuiting the neutral conductor and calculating the impedance between the phase conductors at the far end of the cable. The equivalent impedance is then given by:
Z_eq = Z_far - Z_3f/Z_33*Z_f3
where Z_far is the impedance matrix of the cable without the neutral conductor (i.e., the 2x2 matrix for the phase conductors), Z_3f and Z_f3 are the mutual impedances between the neutral conductor and each phase conductor, respectively.
Using the values above, we have:
Z_3f = Z_f3* = -j0.0669 Ω
Z_far = [Z11 Z12; Z21 Z22] = [0.4637+j0.1369 -j0.0531; -j0.0531 0.4637+j0.1369]
Z_33 = Z_self = 0.1837+j0.0418 Ω
Substituting these values, we get:
Z_eq = [0.4410+j0.1559 -j0.0562; -j0.0562 0.4410+j0.1559]
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Calculate the mechanical energy per unit mass of a flowing fluid if its kinetic, potential, and flow energy per unit mass are 25 kJ,45 kJ, and 32 kJ, respectively. 102 kJ
The mechanical energy per unit mass of the flowing fluid is 102 kJ.
The mechanical energy per unit mass of a flowing fluid is the sum of its kinetic energy, potential energy, and flow energy per unit mass.
Kinetic energy per unit mass = 25 kJ
Potential energy per unit mass = 45 kJ
Flow energy per unit mass = 32 kJ
The mechanical energy per unit mass is therefore:
Mechanical energy per unit mass = Kinetic energy per unit mass + Potential energy per unit mass + Flow energy per unit mass
= 25 kJ + 45 kJ + 32 kJ
= 102 kJ
Therefore, the mechanical energy per unit mass of the flowing fluid is 102 kJ.
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Large electrical currents are often carried in aluminum conductors. Consider a long, 2-cm-diameter cable covered by insulation 2 mm thick. For a particular application, the outside insulation temperature is limited to 35 °C, and none of the insulation can exceed 50 °C. The cable is in an environment in which the convective heat transfer coefficient is 25 W/m^2.K, the air temperature is 24°C, the insulation thermal conductivity is 0.10 W/m·K, and the electrical resistance per unit length of the wire is 3.9 x 10^-4 Ω/m. Determine the maximum current allowed (in A).
The maximum current allowed in the long, 2-cm-diameter cable covered by insulation 2 mm thick is approximately 1300 A. To determine the maximum current allowed, we need to consider the heat generated by the electrical current and its effect on the insulation temperature.
The heat generated per unit length of the wire can be calculated using the formula: \(heat = I^2 R\), where I is the current and R is the electrical resistance per unit length. In this case,\(heat = (I^2) (3.9 \times 10^{-4} \Omega/m)\). The heat generated must be dissipated through convection from the cable's surface. The rate of heat dissipation can be calculated using the formula: \(Q = hA(T_s - T_a)\), where Q is the heat dissipation rate, h is the convective heat transfer coefficient, A is the surface area of the cable, Ts is the surface temperature of the insulation, and Ta is the air temperature.
By equating the heat generated to the heat dissipation rate, we can solve for the maximum current allowed. Considering the cable's diameter and insulation thickness, we can calculate the surface area of the cable. By substituting the given values, including the temperature limits, we find that the maximum current allowed is approximately 1300 A.
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At steady state, air at 200 kPa, 325 K, and mass flow rate
of 0.5 kg/s enters an insulated duct having differing inlet
and exit cross-sectional areas. The inlet cross-sectional area is
6 cm26cm
2. At the duct exit, the pressure of the air is 100 kPa and the velocity is 250 m/s. Neglecting potential energy
effects and modeling air as an ideal gas with constant cp=1.008 kJ/kg⋅Kc
p =1.008kJ/kg⋅K, determine
(a) the velocity of the air at the inlet, in m/s.
(b) the temperature of the air at the exit, in K.
(c) the exit cross-sectional area, in cm2
(a) the velocity of the air at the inlet, in m/s.
(b) the temperature of the air at the exit, in K.
(c) the exit cross-sectional area, in cm
You have been allocated a club instance to conduct pic for a customer.what steps do you need to follow before initiating the pic ?
Explanation:
1. Verify the scope of work: Make sure you understand the scope of work and requirements for the customer's club instance. Confirm with the customer if any specific settings or customizations are required.
2. Schedule the PIC: Coordinate with the customer to schedule a suitable time and date for the PIC. Ensure that all necessary stakeholders are available and informed.
3. Review the customer's club instance: Review the customer's club instance to identify any potential issues or conflicts that need to be addressed during the PIC. Check the instance for any configuration, integration, or data issues.
4. Prepare for the PIC: Prepare a checklist and any necessary tools or documentation for the PIC. Make sure you have access to the customer's club instance, including any necessary login credentials or permissions.
5. Initiate the PIC: Once you have completed the above steps, initiate the PIC by going through the checklist and verifying that the customer's club instance is set up correctly and meets their requirements. Identify any issues or gaps that need to be addressed and work with the customer to resolve them.
6. Follow up: Once the PIC is complete, provide the customer with a report or summary of the findings. Follow up with any necessary actions or next steps, and confirm that the customer is satisfied with the results
This wired networking standard specifies the order in which data is sent through the network.
Select one:
a. Ethernet
b. WiMAX
c. LTE
d. TCP/IP
The wired networking standard that specifies the order in which data is sent through the network is Ethernet.
Ethernet is a widely used wired networking standard that defines the protocols and specifications for data transmission over a local area network (LAN). It specifies the order in which data is sent through the network by utilizing the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) algorithm.
The CSMA/CD algorithm ensures that multiple devices connected to an Ethernet network can share the same communication medium without interfering with each other. Before transmitting data, a device using Ethernet listens to the network to detect if it is clear to send data. If the network is busy, it waits for an opportune moment. Once the network is clear, the device sends the data, constantly monitoring for collisions. If a collision occurs (when two or more devices transmit data simultaneously), they stop transmitting, wait for a random period of time, and then retry.
By following this protocol, Ethernet ensures orderly and efficient data transmission within the network, minimizing collisions and maximizing data throughput. It has become the de facto standard for wired local area networks due to its reliability, scalability, and widespread adoption.
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The following problem refers to triangle ABC, find all missing parts. Round degrees to 1 decimal places and
sides to the nearest whole number.
A = 36.5°C = 67.5°, c = 224 inches
A=
В.
C
O
O
490 do
a =
inches
inches
inches
C-
Answer:
A =41 .....
......
......
....C=21
The production of carbon dioxide makes it unwise and unsafe to operate a tractor or any motor vehicle inside enclosed spaces such as a barn.
True
False
how should email be considered similar to a phone call
Answer:
Emails and phone calls are both common forms of communication that are used in professional and personal settings. There are several similarities between email and phone calls:
1. Both are asynchronous forms of communication: Unlike instant messaging or face-to-face conversations, both emails and phone calls allow the sender or recipient to respond at their convenience. They don't require immediate attention or an instant response.
2. Both are written forms of communication: While phone calls rely on spoken words, emails are written. As a result, both can be used to convey detailed information and allow the sender to carefully consider their words before sending.
3. Both are forms of direct communication: Emails and phone calls both allow for direct communication between two parties. This can be beneficial for discussing sensitive information or resolving issues quickly.
4. Both can be used for formal and informal communication: Emails and phone calls can be used in both personal and professional contexts. They are both flexible forms of communication that can be adapted to fit different situations.
5. Both require attention to tone and etiquette: Just like with phone calls, emails require attention to tone and proper etiquette. Both forms of communication should be approached professionally and respectfully to ensure effective communication.
In conclusion, while there are differences between emails and phone calls, there are also similarities that make them useful communication tools. Both allow for direct, asynchronous communication and can be adapted to fit different situations.
Explanation:
elements of parallel computing
\(\huge{\orange}\fcolorbox{purple}{cyan}{\bf{\underline{\green{\color{pink}Answer}}}} \)
Elements of parallel computing:Computer systems organization. Computing methodologies. General and reference. Networks. Software and its engineering.Theory of computation.the partner who can lose only what he or she has invested in business is the
Answer:
partner itself
Explanation:
Answer:
limited partner
hope this answer correct :)
which other factors do you need to consider when preparing to move gondolas?
The factors that you need to consider when preparing to move gondolas are:
Heightwidthlength color. How do you move a gondola?In choosing gondola one need to look at some factor in decisions such as height.
Know that it is good to consider the construction material and also the center wall configuration for its building also.
The factors that you need to consider when preparing to move gondolas are:
Heightwidthlength color.Learn more about gondola from
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1.1.1.1, Which of the following are learning objectives for this MOOC?
Check 3 options.
1. Communicate clearly across a variety of different contexts and to a wide range of audiences by adapting communicative styles appropriately according to cultural and societal expectations.
2. Recognize and apply analytical problem solving techniques.
3. Critically evaluate the reliability of sources for an academic context.
4. Filter, manage and organize information from a wide variety of sources for use in academic study.
5. Demonstrate awareness of ethical issues related to academic integrity surrounding the access and use of information.
6. Understand the importance and function of critical thinking in academic culture.
The learning objectives for this Massive Open Online Course (MOOC) include these three (3) options:
3. "Critically evaluate the reliability of sources for an academic context."
4. "Filter, manage and organize information from a wide variety of sources for use in academic study."
5. "Demonstrate awareness of ethical issues related to academic integrity surrounding the access and use of information."
What is an online course?An online course can be defined as an academic programme that typically involves the process of providing and sharing learning resources (contents) in an organized way over the Internet, so as to allow the students (users) progress in their understanding of a course or topic.
What is MOOC?MOOC is an abbreviation for Massive Open Online Course and it can be defined as a free online course that is designed and developed to be made available for anyone to enroll over the Internet, in order to provide interested persons an affordable and flexible way to learn and acquire new skills.
In conclusion, the learning objectives for this Massive Open Online Course (MOOC) include these three (3) options:
3. "Critically evaluate the reliability of sources for an academic context."
4. "Filter, manage and organize information from a wide variety of sources for use in academic study."
5. "Demonstrate awareness of ethical issues related to academic integrity surrounding the access and use of information."
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potential difference is the work done in moving a unit positive charge from one point to another in an electric field. State True/False.
Answer:
True
Explanation:
Because the Electric Magnetic Field is the work done per unit charge where other forms of energy is tranferred to electrical energy
a special construct used in a shell script to alter the flow of the program based on the outcome of a command or contents of a variable. common decision constructs include if, case, &, and ||.
We are referring to is "Conditional Statements" or "Decision Constructs" in shell scripting. Conditional statements are used to alter the flow of a program based on certain conditions or the outcome of a command or the contents of a variable.
The common decision constructs in shell scripting include:
if statement: The if statement allows you to execute a block of code if a certain condition is true. It has the following syntax:
if condition
then
# code to be executed if condition is true
else
# code to be executed if condition is false
fi
case statement: The case statement is used to match the value of a variable against multiple patterns and execute corresponding code blocks. It has the following syntax:
css
case variable in
pattern1)
# code to be executed if pattern1 matches
;;
pattern2)
# code to be executed if pattern2 matches
;;
...
*)
# code to be executed if no pattern matches
;;
esac
logical operators: The logical operators && (AND) and || (OR) are used to combine multiple conditions and control the flow of the program based on the outcome. For example:
command1 && command2
The command2 is executed only if command1 succeeds (returns an exit status of 0).
command1 || command2
The command2 is executed only if command1 fails (returns a non-zero exit status).
These decision constructs provide flexibility in controlling the program flow and allow you to handle different scenarios based on conditions and variables.
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you are asked to look into adding a circuit for a new pump in a hydraulics lab. after some investigation of the electrical service in the building you find that there are a few voltage options; 120v, single-phase; 208v, single-phase; 208v, 3-phase, 277v, single-phase; 480v, 3-phase. which pump electrical choice would be the most economical in terms of first cost for electrical construction materials and overall electrical efficiency?
To determine the most economical pump electrical choice in terms of first cost for electrical construction materials and overall electrical efficiency, we need to consider the voltage options and the specific requirements of the pump.
120V, single-phase: This voltage option is commonly available and relatively easy to work with. However, it may not be suitable for larger pumps that require higher power due to the limited voltage level.
208V, single-phase: This voltage option provides a higher voltage level than 120V, allowing for more power output. However, it is still limited to single-phase, which may not be sufficient for larger pumps.
277V, single-phase: This voltage option provides an even higher voltage level than the previous options, but it is limited to single-phase. Similar to 208V, single-phase, it may not be suitable for larger pumps.
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“Snow Cover Area change Analysis for Kabul Basin”
Summarize how GIS & Remote Sensing is incorporated in this study.
GIS
The full for GIS is : Geographic Information System.
The GIS is a system of mapping that is used to create, analyze, manage and map all the types of data.
It is a method capturing, checking as well as displaying all the data that is related to the position of the surface of earth.
Remote Sensing
Remote sensing is defined as a process where the various physical characteristics of an area are constantly monitored and detected by a process of measuring the reflection of the emitted radiations at ta distance.
The snow covered areas of the Kabul basin can be monitored and analyzed by using the process of GIS and remote sensing.
They provide a continuous source of information and data about snow covered peaks, the amount of snow to the authorities.
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Consider the equation y = 10^(4x). Which of the following statements is true?
A plot of log(y) vs. x would be linear with a slope of 4.
A plot of log(y) vs. log (x) would be linear with a slope of 10.
A plot of log(y) vs. x would be linear with a slope of 10.
A plot of y vs. log(x) would be linear with a slope of 4.
A plot of log(y) vs. log (x) would be linear with a slope of 4.
A plot of y vs. log(x) would be linear with a slope of 10.
Answer: Plot of \(\log y\) vs \(x\) would be linear with a slope of 4.
Explanation:
Given
Equation is \(y=10^{4x}\)
Taking log both sides
\(\Rightarrow \log y=4x\log (10)\\\Rightarrow \log y=4x\)
It resembles with linear equation \(y=mx+c\)
Here, slope of \(\log y\) vs \(x\) is 4.
principle of operation of Diacs using the four layers
Answer:
Explanation:
It is a device which consists of four layers and two terminals. The construction is almost the same as that of the transistor. But there are certain points which deviate from the construction from the transistor. The differentiating points are-
There is no base terminal in the DIAC
The three regions have almost the same level of doping
It gives symmetrical switching characteristics for either polarity of voltages
DIAC Diode
The need for extraction of raw metals for making steel has been reduced due to the?
Answer: Increase in minimills
Explanation:
help protect the lower legs and feet from heat hazards like molten metal and welding sparks
Answer:
i think its called leggings thats wut my shop teacher told me
Explanation:
A picture showing the actual parts of a circuit and their connection is called_______ diagram
Answer:
a picture showing the actual parts of a circuit and their connection is call a Circuit diagram
Use MySQL Workbench to create an EER diagram for a database that stores information about products. Each product must have a product name, description, and price. Each product must belong to one category. Each category must have a category name and description. Each category can include multiple products.
Launch MySQL Workbench, create two entities (Product, Category), define attributes, and establish a relationship.
How to create an EER diagram in MySQL Workbench?To create an EER diagram for the product database in MySQL Workbench, follow these steps:
Launch MySQL Workbench and open a new EER Model.
Create two entities: "Product" and "Category". Add the following attributes to the "Product" entity: product_id (primary key), product_name, description, and price. Add the following attributes to the "Category" entity: category_id (primary key), category_name, and description.
Create a relationship between the "Product" and "Category" entities. This relationship represents the fact that each product belongs to a category. Set the cardinality to "1:N" (one category can have multiple products) and the referential action to "Restrict" (to ensure integrity).
Save the EER diagram.
Generate the database schema from the EER diagram by selecting "Database" -> "Forward Engineer" -> "Continue" -> "Execute".
Specify the database connection details and proceed to generate the schema.
The database schema will be created based on the EER diagram, representing the tables and relationships for the product information.
By following these steps, you can create an EER diagram in MySQL Workbench for a product database that stores information about products and their categories.
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What is the stress term called which is a measure of the stiffness or resistance to deflection?
Modulus of Elasticity (E)
Extreme Fiber Bending (F )
Horizontal Shear Parallel to the Grain (F //)
Compression Perpendicular to the Grain (F z )
Answer:Modulus of Elasticity (E)-------- A
Explanation:
The modulus of elasticity, Young's modulus E is a measure of a material's stiffness or resistance to being elastically deformed when stressed or due to tension According to Hook's law the modulus of elasticity is defined as the ratio of the stress to the strain and defined as the slope of its stress-strain region in the stress and strain graph.
--The stiffer a material, the higher the elastic modulus and vice versa for a less stiff material.
it can be calculated with this formulae
Young’s modulus equation is E = tensile stress/tensile strain
= (FL) / (A X change in L)
where F = applied force,
L = initial length,
A = square area,
E = Young’s modulus in Pascals (Pa).
A rigid vessel of volume A rigig vessel of volume 0.2 m
3
contains nitrogen at 0.1MPa and 15
∘
C. If 0.2 kg of nitrogen is now pumped into the vessel, calculate the new pressure when the vessel has returned to its original temperature. (R
nitrogen
=0.2969 kJ/kgK)>R
2
The new pressure when the vessel has returned to its original temperature is approximately 0.4 MPa.
To solve this problem, we can use the ideal gas law, which states that the product of pressure (P), volume (V), and temperature (T) for a given amount of gas remains constant.
First, we need to calculate the initial number of moles of nitrogen in the vessel. We can use the ideal gas equation: PV = nRT
where P is the initial pressure, V is the initial volume, n is the number of moles, R is the specific gas constant for nitrogen (0.2969 kJ/kgK), and T is the initial temperature.
Rearranging the equation to solve for n, we have: n = PV / RT
Substituting the given values, we get:
n = (0.1 MPa * 0.2 m^3) / (0.2969 kJ/kgK * 288.15 K)
n ≈ 0.0068 kg
Next, we calculate the final number of moles after adding 0.2 kg of nitrogen:
n_final = n_initial + m_gas / M
where m_gas is the mass of gas added (0.2 kg) and M is the molar mass of nitrogen (28.0134 kg/kmol).
n_final = 0.0068 kg + 0.2 kg / 28.0134 kg/kmol
n_final ≈ 0.0134 kmol
Finally, we can determine the new pressure using the same ideal gas equation:
P_final = n_final * R * T / V
Substituting the known values, we have:
P_final = (0.0134 kmol * 0.2969 kJ/kgK * 288.15 K) / 0.2 m^3
P_final ≈ 0.4 MPa
Therefore, the new pressure when the vessel has returned to its original temperature is approximately 0.4 MPa.
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Which phase involves research to determine exactly what the client expects?
brainstorming
identifying the need
preventive maintenance
building a model
The phase identifying the need involves research to determine exactly what the client expects. The correct option is B.
What is research?
Research is a systematic inquiry process that includes data gathering, documentation of important information, analysis, and interpretation of that data and information.
These all are in accordance with appropriate procedures established by particular academic and professional disciplines.
Action-informing research is its goal. As a result, your study should attempt to place its findings in the perspective of the wider body of knowledge. In order to develop knowledge that is usable outside of the research setting, research must constantly be of the highest calibre.
Research is done during the step of determining the need to ascertain the precise expectations of the client.
Thus, the correct option is B.
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URGENT NEED HELP BY AN HOUR
C++ ONLY
Given a line of text as input: (1) output the number of characters excluding the three characters commonly used for end-of-sentence punctuation( period, exclamation point, and question mark), (2) then output the number of end-of-sentence punctuation characters that were found. You can just do (1) to pass the first few test cases for partial credit, then do (2) for full credit.
Ex: If the input is "Listen, Sam! Calm down. Please.", the output is:
28
3
Ex: If the input is "What time is it? Time to get a watch! O.K., bye now.", the output is:
43
5
Using the knowledge in computational language in python it is possible to write a code that output the number of characters excluding the three characters commonly used for end-of-sentence punctuation.
Writting the code:import re
def check_sentence(text):
result = re.search(r"^[A-Z][A-Za-z\s]*[\.\?!]$", text)
return result != None
print(check_sentence("Is this is a sentence?")) # True
print(check_sentence("is this is a sentence?")) # False
print(check_sentence("Hello")) # False
print(check_sentence("1-2-3-GO!")) # False
print(check_sentence("A star is born.")) # True
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The point at 0°, 0° is
What is the hexadecimal (base 16) value of the decimal 25? A. 11001 B. 19 C. AS D. 20
Answer:
19
Explanation:
i think this is the right answer
hope it helps :)
procedures involving sharps, such as needles, scalpels, or glass pasteur pipettes do not represent risk if the manipulations with biohazards occur within a biological safety cabinet.a. true b. false
The statement "Procedures involving sharps, such as needles, scalpels, or glass Pasteur pipettes do not represent a risk if the manipulations with biohazards occur within a biological safety cabinet" is b. false.
The biological safety cabinets provide protection and help reduce the risk of exposure to biohazards, there is still a potential risk when working with sharps, as they can cause accidental punctures or cuts, leading to potential exposure to hazardous materials. It is important to follow proper safety protocols when working with sharps, even within a biological safety cabinet.
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