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: DNA is made up of nucleotides. 
Sentence2: Mutations can change the structure of DNA.

SOLUTION: DNA

PROBLEM: Sentence1: if an object is made of a material then that object has the properties of that material. 
Sentence2: An object is an item in the real world.

SOLUTION: object

PROBLEM: Sentence1: Blood type is important for medical reasons. 
Sentence2: Blood type is important in case of an acute stroke.

SOLUTION:
Blood