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.

Input: Consider Input: Sentence1: Combustion-related, motor vehicles, wood burning, open burning, industrial processes. 
Sentence2: Combustion is used to produce heat.

Output: Combustion-related


Input: Consider Input: Sentence1: Babies that are very large or very small at birth are less likely to survive. 
Sentence2: Poor nutrition while in the womb is the major reason why babies are small at birth.

Output: birth


Input: Consider Input: Sentence1: An enlarged cummerbund-like band near the worm's head holds the reproductive organs. 
Sentence2: An enlarged cummerbund-like band goes through a major transformation in worms.


Output: cummerbund-like