Question: Consider an array $A$ of $n$ elements where each element appears exactly twice in $A$ , e . g . $A = [ 9 ,

Consider an array $A$ of $n$ elements where each element appears exactly twice in $A$, e.g. $A=[9,7,7,1,9,1,3,5,3,5]$. For any two elements $A[i]$, $A[j]$ in the array, we may only compare the elements by testing equality, i.e., $A[i]\overset{?}{=} A[j]$. With this in mind

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