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: Plants use unsaturated fatty acids to store energy. 
Sentence2: Plants and fish contain fatty acids.

SOLUTION: Plants

PROBLEM: Sentence1: when a river floods , that river deposits soil in flood plains. 
Sentence2: when a river floods, it deposits soil in generally marshy areas.

SOLUTION: deposits

PROBLEM: Sentence1: breaking apart rocks can cause debris. 
Sentence2: Breaking apart rocks can cause construction clean up.

SOLUTION:
apart