Question: For similarly, given two Mealy machines, let (Me 1 )(Me 2 ) mean that an input string is processed on Me 1 and then the

For similarly, given two Mealy machines, let (Me1)(Me2) mean that an input string is processed on Me1 and then the output string is immediately fed into Me2 (as input) and reprocessed. Only this second resultant output is considered the final output of (Me1)(Me2). If the final output string is the same as the original input string, we say that (Me1)(Me2) has the identity property, symbolically written (Me1)(Me2) = identity.
Given two specific machines such that (Me1)(Me2) reproduces the original bit string, we aim to prove (in the following two problems) that (Me2)(Me1) must necessarily also have this property.

Show that the 2n possible n-bit strings when fed into Me1 give 2n different outputs.

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