"[Substr] returns a string object with its contents initialized to a substring of the current object."

uncopyrightable (15 letters).

A suffix tree is a data structure that stores all the suffixes of a given string in a way that allows for efficient pattern matching and substring search operations. It is commonly used in string processing algorithms like finding repeated substrings, longest common substrings, and pattern matching.

it will give the substring of length(as per the user) from the actual string,and the starting length from where it has to copy the substring from actual should be given by the user.

7.207 repeated