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: Running water is better able to dissolve oxygen and nutrients than standing water. 
Sentence2: Oxygen and nutrients dissolve easily in rivers.

Output: dissolve


Input: Consider Input: Sentence1: when a river floods , that river deposits soil in flood plains. 
Sentence2: Hurricanes can cause local flooding, flash flooding, or coastal flooding.

Output: flood


Input: Consider Input: Sentence1: Most sponges are hermaphroditic, meaning that a single organism has both eggs and sperm. 
Sentence2: Adult sponges are a single organism that produce seed and eggs.


Output: eggs