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: condensing causes a liquid to form. 
Sentence2: Air carries moisture that causes a liquid to form.

Output: causes


Input: Consider Input: Sentence1: Ribosomes are small organelles where proteins are made. 
Sentence2: Ribosomes are assembled inside the nucleus.

Output: Ribosomes


Input: Consider Input: Sentence1: most canyons are formed by flowing rivers through erosion over long periods of time. 
Sentence2: Any erosion can be devastating.


Output: erosion