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: Most bryophytes are small. 
Sentence2: Most in the same group as mosses are small.

SOLUTION: small

PROBLEM: Sentence1: plant reproduction requires pollination. 
Sentence2: Plant reproduction requires insects and hummingbirds.

SOLUTION: plant

PROBLEM: Sentence1: high pressure systems cause clear weather. 
Sentence2: Weather today is said to be sunny and clear.

SOLUTION:
clear