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: Consider Input: Sentence1: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.

Output: Some


Input: Consider Input: Sentence1: Weather Clear weather usually means good visibility. 
Sentence2: High pressure systems can cause good visibility.

Output: good


Input: Consider Input: Sentence1: Fingernails prevent injury by forming protective plates over the ends of the fingers. 
Sentence2: Something made of keratin prevents injury by forming protective plates.


Output: forming