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: a sifter is used for separating mixtures. 
Sentence2: a sifter is used for some recipes.
answer:
sifter


question:
Sentence1: a flashlight converts chemical energy into light energy. 
Sentence2: Chemical energy converted to light energy requires batteries.
answer:
chemical


question:
Sentence1: Infrequente urination or urine is dark yellow. 
Sentence2: If pee leaves the body through a sphincter infrequently it will be dark yellow.
answer:

Infrequente