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: when a river floods , that river deposits soil in flood plains. 
Sentence2: when a river floods, it deposits soil in generally marshy areas.

Output: deposits


Input: Consider Input: Sentence1: Some birds are pollinators that co-evolved with plants. 
Sentence2: insects pollinate plants.

Output: plants


Input: Consider Input: Sentence1: harming an animal species causes that animal 's population to decrease. 
Sentence2: Harming a certain kind of organism causes that animal's population to decrease.


Output: an