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: a flashlight converts chemical energy into light energy. 
Sentence2: Chemical energy converted to light energy requires batteries.
[EX A]: chemical

[EX Q]: Sentence1: Protein Protein is needed for tissue maintenance and repair. 
Sentence2: protein repairs cells.
[EX A]: Protein

[EX Q]: Sentence1: Flooding is a major concern, volcanoes threaten to erupt, and earthquakes can potentially cause destruction through ground shaking or liquefaction. 
Sentence2: The ground shaking can cause destruction.
[EX A]:
cause