Definition: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
Input: Sentence1: Condoms can break; Condoms can be used incorrectly. 
Sentence2: condoms used incorrectly can risk both pregnancy and infection.

used