Sets And Relations

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