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: a flower 's purpose is to produce seeds. 
Sentence2: Every job has meaning and purpose.

Output: purpose


Input: Consider Input: Sentence1: if an organism becomes too hot then that organism may die. 
Sentence2: if an organism overheats then that organism may die.

Output: die


Input: Consider Input: Sentence1: Caecilians are primitive amphibians that resemble earthworms. 
Sentence2: Earthworm-like amphibians live in soil near rivers in tropical regions.


Output: amphibians