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.

[EX Q]: Sentence1: if soil is permeable then water easily flows through that soil. 
Sentence2: The increase in permeability is caused by the formation and expansion of ice in the soil.
[EX A]: permeable

[EX Q]: Sentence1: If there is no movement friction is zero. 
Sentence2: Movement causes the temperature of an object to increase.
[EX A]: movement

[EX Q]: Sentence1: Interestingly, a squid is also a mollusk. 
Sentence2: Squids reproduce sexually.
[EX A]:
squid