M28:=[
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    [ <1, 9>, <2, -4>, <4, -1>, <7, 1>, <14, -4>, <28, 7> ],
    [ <1, -1>, <2, 8>, <4, -5>, <7, -1>, <14, -4>, <28, 11> ],
    [ <1, 1>, <2, 5>, <4, -4>, <7, 1>, <14, -7>, <28, 12> ],
    [ <1, -2>, <2, 6>, <4, -4>, <7, -2>, <14, -2>, <28, 12> ],
    [ <1, 0>, <2, 3>, <4, -3>, <7, 0>, <14, -5>, <28, 13> ],
    [ <1, 2>, <2, 0>, <4, -2>, <7, 2>, <14, -8>, <28, 14> ],
    [ <1, 12>, <2, -2>, <4, -2>, <7, -4>, <14, 6>, <28, -2> ],
    [ <1, 14>, <2, -5>, <4, -1>, <7, -2>, <14, 3>, <28, -1> ],
    [ <1, 7>, <2, 6>, <4, -5>, <7, -1>, <14, -2>, <28, 3> ],
    [ <1, 16>, <2, -8>, <4, 0>, <7, 0>, <14, 0>, <28, 0> ],
    [ <1, 6>, <2, 4>, <4, -4>, <7, -2>, <14, 0>, <28, 4> ],
    [ <1, 8>, <2, 1>, <4, -3>, <7, 0>, <14, -3>, <28, 5> ],
    [ <1, 5>, <2, 2>, <4, -3>, <7, -3>, <14, 2>, <28, 5> ],
    [ <1, 7>, <2, -1>, <4, -2>, <7, -1>, <14, -1>, <28, 6> ]
];

