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: Acid rain is precipitation which pH is 5.7 or lower. 
Sentence2: gases from burning coal causes precipitation which pH is 5.7 or lower.
[EX A]: 5

[EX Q]: Sentence1: Mollusks live in most terrestrial, freshwater, and marine habitats. 
Sentence2: Clams live in freshwater habitats.
[EX A]: freshwater

[EX Q]: Sentence1: Chemical Bonding A chemical bond is the sharing or transfer of electrons. 
Sentence2: The transfer of electrons occurs when substances react with one another.
[EX A]:
electrons