Yet Another String Problem

Consider a set of $N$ strings and a target string $S$. The set of $N$ strings and the target string contain lowercase English characters. The following defines one operation on a string $X$. - Choose any string from the initial set of $N$ strings, say $s$. - Choose any substring of the chosen string (any substring of $s$). The length of this substring has to be **strictly greater than 1**. - Con