* to satisfy the user-supplied similarity constraint. A negative result avoids
* invoking the O(m * n) behaviour of LCS at the cost of O(m + n) in the two
* strlen() invocations.
* to satisfy the user-supplied similarity constraint. A negative result avoids
* invoking the O(m * n) behaviour of LCS at the cost of O(m + n) in the two
* strlen() invocations.