1. Write a program that can perform the Caesar cipher for English messages that include both upper- and lowercase characters.
2. Implement a class, SubstitutionCipher, with a constructor that takes a string with the 26 uppercase letters in an arbitrary order and uses that as the encoder for a cipher (that is, A is mapped to the first character of the parameter, B is mapped to the second, and so on.) You should derive the decoding map from the forward version.
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