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: Most cells are too small to be seen without a microscope. 
Sentence2: Cells vary in size as well as shape and are seen with a microscope.

seen