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Let A ={1,2,3,.......,10} and B ={0,1,2,...

Let `A ={1,2,3,.......,10}` and `B ={0,1,2,3,4}` The number of elements in the relation `R ={(a,b) in A times A : 2(a-b)^2+3(a-b) in B}` is ___.

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