instruction:
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.
question:
Sentence1: a switch is used to start the flow of current in an electrical circuit. 
Sentence2: The flow of electrical current powers a light bulb.
answer:
current


question:
Sentence1: folding an object causes that object to change shape. 
Sentence2: Folding an object causes that object to transform.
answer:
causes


question:
Sentence1: Aerosol is a collection of particulates. 
Sentence2: aerosol contributes to smog.
answer:

Aerosol