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: All sharks are predators. 
Sentence2: hiding can be used for avoiding sharks.
[EX A]: sharks

[EX Q]: Sentence1: the emission of sulfur dioxide causes acid rain. 
Sentence2: the emission of sulfur dioxide causes soil weathering.
[EX A]: causes

[EX Q]: Sentence1: when a hemisphere is tilted away from the sun , that hemisphere receives less direct sunlight. 
Sentence2: The less direct the sunlight, the colder the weather.
[EX A]:
direct