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: All photos are digital images. 
Sentence2: satellites are used to take photos from space.

SOLUTION: photos

PROBLEM: Sentence1: Autumn brings the changing of the seasons. 
Sentence2: Earth 's tilt on its rotating axis causes autumn.

SOLUTION: Autumn

PROBLEM: Sentence1: the uterus is used in reproduction. 
Sentence2: Once embryos are formed, they are placed back into the uterus of the female.

SOLUTION:
uterus