Let A be a set with $\lvert A \rvert$ = $4$. What is the max number of elements tht a relation R on A can contain so tht $R \cap R^{-1}$ = $\emptyset$

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Let A be a set with $\lvert A \rvert$ = $4$. What is the max number of elements tht a relation R on A can contain so tht $R \cap R^{-1}$ = $\emptyset$

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