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: Producers make food from inorganic molecules. 
Sentence2: Decomposition is the breakdown of organic molecules into inorganic molecules.

Output: inorganic


Input: Consider Input: Sentence1: air pollution can cause the pH of soil to decrease. 
Sentence2: Acidity is measured with a pH meter or with pH paper strips.

Output: pH


Input: Consider Input: Sentence1: Secondary growth forms secondary vascular tissues and bark. 
Sentence2: Dead or missing bark indicates loss of actively growing vascular tissue.


Output: tissues