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: friction causes the temperature of an object to increase. 
Sentence2: pressure causes the temperature of an object to increase.

Output: causes


Input: Consider Input: Sentence1: People of all ages and activity levels perspire or sweat. 
Sentence2: Perspiration reduces body heat.

Output: perspire


Input: Consider Input: Sentence1: Chromosomes are the form of the genetic material of a cell during cell division. 
Sentence2: chromosomes are the form of genetic material of a cell during mitosis.


Output: Chromosomes