Let A be the set of first 10 natural numbers and let $\mathrm{R}=\left\{\right(\mathrm{x},\mathrm{y})/\mathrm{x}\in \mathrm{A},\mathrm{y}\in \mathrm{N}\text{ and }\mathrm{x}+2\mathrm{y}=10\}$ then $\mathrm{n}\left\{\mathrm{dom}\left({\mathrm{R}}^{-1}\right)\right\}=$

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