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: folding an object causes that object to change shape. 
Sentence2: Folding an object causes that object to transform.
[EX A]: causes

[EX Q]: Sentence1: Every photograph is produced by a camera. 
Sentence2: Photographers record images.
[EX A]: photograph

[EX Q]: Sentence1: Volume means how much space the ingredient takes up. 
Sentence2: How much space an object takes up can be used to describe the size of the object.
[EX A]:
how