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Given a list of people, write a method to return a list of pairs such that each person is paired with another.
Example:
Input: {steven, john, amy, wuyifan}
expected output: {steven， john}， {amy， wuyifan}
Follow up:
Use the method multiple times and ensure the paring for each person is different each time.
Example output of the second call: {steven，amy}， {john， wuyifan}
Follow up 2: Support random pairing.
Given a list of people, write a method to return a list of pairs such that each person is paired with another.
Example:
Input: {steven, john, amy, wuyifan}
expected output: {steven， john}， {amy， wuyifan}
Follow up:
Use the method multiple times and ensure the paring for each person is different each time.
Example output of the second call: {steven，amy}， {john， wuyifan}
Follow up 2: Support random pairing.
Output