Let $A=\{2,3,4\}$ and $B=\{8,9,12\}$. Then the number of elements in the relation $R=\left\{\left(\left(a_1, b_1\right),\left(a_2, b_2\right)\right)\right. \in(A \times B, A \times B): a_1$ divides $b_2$ and $a_2$ divides $\left.b_1\right\}$ is :
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