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: Refraction is the bending of light. 
Sentence2: a rainbow is formed by bending of light by separating light into all different colors.
answer:
bending


question:
Sentence1: Contact with infected blood, contaminated needles. 
Sentence2: scraping oneself on an infected needle may cause infection.
answer:
infected


question:
Sentence1: An increase in temperature is the result of the flow of heat into the system. 
Sentence2: increasing the temperature of salt water causes the water to evaporate while the salt remains.
answer:

increase