instruction:
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.
question:
Sentence1: exercise increases a body 's strength. 
Sentence2: Exercise is more than running and lifting.
answer:
exercise


question:
Sentence1: keeping food cold is used for keeping food fresh. 
Sentence2: Keeping food at 40 degrees F or lower is used for keeping food fresh.
answer:
food


question:
Sentence1: Birds have very large chest muscles called pectorals which are used to flap the wings. 
Sentence2: Birds use pectorals to move their wings.
answer:

pectorals