In Python write a function decoding() that takes an encoded string and an integer as the parameters, and returns the original string. The encoding was performed as follows. First, the original string is reversed. Then, each character in the new string is replaced by the character that is a given number of positions away in the ASCII character encoding table. For example, the following call to yur function : encoding('ABCabc', -10) should return the encoded string 'YXW987'.

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