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: being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time. 
Sentence2: extreme heat and pressure in a swamp over a long period of time creates bogs.

time