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.

Ex Input:
Sentence1: Producers use energy and inorganic molecules to make food. 
Sentence2: Green plants use energy and inorganic molecules to make food.

Ex Output:
energy


Ex Input:
Sentence1: Infection is what ultimately leads to death. 
Sentence2: scraping oneself on a contaminated object may cause death.

Ex Output:
death


Ex Input:
Sentence1: a solution is formed by one substance being dissolved in another substance. 
Sentence2: a solution is formed by a solid, liquid, or gas being dissolved in another solid, liquid, or gas.

Ex Output:

dissolved