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#include <iostream>
#include <string>
template< class ForwardIt1, class ForwardIt2 >
bool is_subset(ForwardIt1 first1, ForwardIt1 last1,
ForwardIt2 first2, ForwardIt2 last2)
{
auto initial = first2;
for (; (first1 != last1) && (first2 != last2); ++first1)