Definition: 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: Sentence1: Each system is equipped with a control, a heat producer, a heat exchanger, and a heat distributor. 
Sentence2: buildings use a combination of production, exchange, and distribution of energy to regulate temperatures.

distributor