Question: Write a function called pairs. It is passed a string, and should return a list of strings. The length of each string should be 2,

Write a function called pairs. It is passed a string, and should return a list of strings. The length of each string should be 2, and the letters in each of them should consist of all possible permutations of 2 letters from the parameter string.

>>> pairs('') [ ] >>> pairs ('a') [ ] >>> pairs('ab') ['ab', 'ba'] >>> pairs('abc') ['ab', 'ac', 'ba', 'bc', 'ca', 'cb']

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