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: Mangoes are propagated vegetatively and by seeds. 
Sentence2: animals propagate mangoes.

SOLUTION: Mangoes

PROBLEM: Sentence1: high pressure systems cause clear weather. 
Sentence2: Weather Clear weather usually means good visibility.

SOLUTION: clear

PROBLEM: Sentence1: measuring the hardness of minerals requires scratching those materials. 
Sentence2: measuring diamonds requires scratching them.

SOLUTION:
measuring