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#include <cstdlib> // Provides size_t // included in permute_append.h
#include <sstream> // provides the << operator for string concatenation. // not using
#include <string> //provides string type...

can you post all your code here

You need to write a permute class that will take first and second strings to rearrange letters in first, followed by second. For example, if the first is “CAT” string and second is “MAN” string,...