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: Many birds perform elaborate courtship dances. 
Sentence2: Many birds perform dances before they mate.
[EX A]: Many

[EX Q]: Sentence1: Mammalian predators include the coyote and bobcat. 
Sentence2: a coyote's teeth is important for digestion.
[EX A]: coyote

[EX Q]: Sentence1: Without myelin, nerves are unable to conduct their electrical impulses. 
Sentence2: Nerves need myelin to function.
[EX A]:
myelin