TASK 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.
PROBLEM: Sentence1: Humans have collected and grown mushrooms for food for thousands of years. 
Sentence2: Yeast and mushrooms are types of fungus.

SOLUTION: mushrooms

PROBLEM: Sentence1: Antibodies are large, Y-shaped proteins that recognize and bind to antigens. 
Sentence2: Some of the antibodies, antophospholipid antibodies, cause blood clots.

SOLUTION: Antibodies

PROBLEM: Sentence1: Systolic blood pressure is the force of blood on the blood vessel walls when the heart contracts. 
Sentence2: Constriction raises systolic blood pressure.

SOLUTION:
Systolic