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: Mitosis is cell division. 
Sentence2: mitosis often causes growth.

SOLUTION: Mitosis

PROBLEM: Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: If an object is made of a drug, then that object has the properties of that drug.

SOLUTION: made

PROBLEM: Sentence1: Another gene, named BRCA2, has also been identified. 
Sentence2: Chromosomes contain BRCA2.

SOLUTION:
BRCA2