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: Antigens are molecules that the immune system recognizes as foreign to the body. 
Sentence2: A molecule of carbohydrate or protein molecule the immune system recognizes as foreign to the body.

immune