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: creating paper requires cutting down trees. 
Sentence2: Rainforests are destroyed by logging and all of the trees are cut down.
[EX A]: cutting

[EX Q]: Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: If an object is made of a drug, then that object has the properties of that drug.
[EX A]: made

[EX Q]: Sentence1: Marble is used for sculptures, and coal is used for fuel and energy like light. 
Sentence2: being buried under mud and soil changes peat into fuel.
[EX A]:
fuel