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 Q]: Sentence1: dew is formed when water vapor condenses over night. 
Sentence2: When water vapor condenses overnight, the temperature has reached the dew point.
[EX A]: condenses

[EX Q]: Sentence1: heating an egg causes a chemical reaction in the egg. 
Sentence2: Insects hatch from eggs.
[EX A]: egg

[EX Q]: Sentence1: Snails are protected by a hard shell on their backs. 
Sentence2: some invertebrates are protected by a hard shell on their backs.
[EX A]:
backs