For example, ball < cat, dog < dorm, Happy < happy, Zoo < ball. A substring of a string is a contiguous block of characters in the string. For example, the substrings of abc are a, b, c, ab, bc, and ...

We define the following terms: Lexicographical Order, also known as alphabetic or dictionary order, orders characters as follows: For example, ball < cat, dog < dorm, Happy < happy, Zoo < ball. A ...