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: Some trees are maples. 
Sentence2: planting maples has a positive impact on an ecosystem.

SOLUTION: maples

PROBLEM: Sentence1: a flashlight requires a source of electricity to produce light. 
Sentence2: Flashlights provide the safest emergency lighting source.

SOLUTION: flashlight

PROBLEM: Sentence1: Genes that are located on the same chromosome are called linked genes. 
Sentence2: Gene A gene is the basic unit of heriditary information.

SOLUTION:
Genes