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: mountains are formed by earthquakes. 
Sentence2: Mountains are formed by moving plates.
answer:
are


question:
Sentence1: Some mollusks are nearly microscopic. 
Sentence2: Some squids are nearly microscopic.
answer:
Some


question:
Sentence1: Intermediate length rays are visible as light. 
Sentence2: when intermediate length rays enter the eye through the pupil it falls on the retina.
answer:

Intermediate