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: melting is when solids are heated above their melting point. 
Sentence2: Ice is a solid, it's cold and it's hard.
[EX A]: solids

[EX Q]: Sentence1: Digestion is the process of breaking down food into components the body can absorb. 
Sentence2: Saliva starts to break down the food.
[EX A]: breaking

[EX Q]: Sentence1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. 
Sentence2: Normal human blood may become unbalanced if the rate of breathing is too fast or too slow.
[EX A]:
become