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: smell is used for finding food by some animals. 
Sentence2: Food includes small rodents and birds.
[EX A]: food

[EX Q]: Sentence1: killing microorganisms in food can be used to extend the shelf life of that food. 
Sentence2: Cooking can be used to extend the shelf life of food.
[EX A]: be

[EX Q]: Sentence1: The Purpose of Refrigeration The fundamental reason for having a refrigerator is to keep food cold. 
Sentence2: a refrigerator keeps food fresh.
[EX A]:
refrigerator

