Let $\mathrm{A}=\{2,3,4,5,6\}$. Let R be a relation on the set $\mathrm{A} \times \mathrm{A}$ given by $(x, y) \mathrm{R}(z, w)$ if and only if $x$ divides $z$ and $y \leq w$. Then the number of elements in R is $\_\_\_\_$。
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