Question: We say that a subsequence A [ 1 . . . m ] of X is mirror symmetric if ( a ) m is odd,

We say that a subsequence A[1... m] of X is mirror symmetric if (a) m is odd, (b) A[m/2]=0, and (c) A[i]+ A[m +1 i]=0 for every 1<= i <=m/2.

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