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Circle Bar ⊖
Monadic Circle Bar means

Reverse First 

      mat
1  2  3  4
5  6  7  8
9 10 11 12

      ⊖ mat
9 10 11 12
5  6  7  8
1  2  3  4
Dyadic Circle Bar means

Rotate First 

      0 1 2 ¯1 ⊖ mat
1  6 11 12
5 10  3  4
9  2  7  8

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