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% time ./challenge < words.txt > digest.txt
Reading in single words.
...
Finding a single universal quadruple.
Universal quadruple found.
952.27u 3.88s 15:57.57 99.8%

#include <string>
#include <vector>
#include <iostream>
...
    for( c = &in[0]; c != NULL; c = c->next )
    out.push_back( *c );
}

#include <string>
#include <vector>
...

    return 0;
}