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.

Ex Input:
Sentence1: infection can cause bodily tissues to swell. 
Sentence2: Bacteria can cause bodily tissues to swell.

Ex Output:
bodily


Ex Input:
Sentence1: Specialization decreases mortality 12,13 and increases survival. 
Sentence2: evolving different adaptations increases survival.

Ex Output:
increases


Ex Input:
Sentence1: Wetting provides moisture to make brine. 
Sentence2: Most aquatic organisms do not have to deal with extremes of temperature or wetness.

Ex Output:

Wetting