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: Dilation occurs when cell walls relax. 
Sentence2: Decreased oxygen levels cause blood vessels to dilate and cell walls to relax.
[EX A]: relax

[EX Q]: Sentence1: a flashlight requires a source of electricity to produce light. 
Sentence2: Flashlights provide the safest emergency lighting source.
[EX A]: flashlight

[EX Q]: Sentence1: Food consists of organic molecules that store energy in their chemical bonds. 
Sentence2: Food consists of organic molecules that store electrical energy.
[EX A]:
Food