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.

[Q]: Sentence1: Carpools and vanpools can save time. 
Sentence2: vanpools decrease the amount of cars used to travel to a place.
[A]: vanpools


[Q]: Sentence1: Insect wings are attached to the dorsal side of their thorax. 
Sentence2: wings are attached to the dorsal side of the insect.
[A]: dorsal


[Q]: Sentence1: Lipids may consist of fatty acids alone, or they may contain other molecules as well. 
Sentence2: the building blocks of lipids may contain other molecules as well.
[A]:
contain