M8:=[
    [ <1, -12>, <2, 30>, <4, -18>, <8, 12> ],
    [ <1, 0>, <2, 0>, <4, -12>, <8, 24> ],
    [ <1, -4>, <2, 10>, <4, -14>, <8, 20> ],
    [ <1, -24>, <2, 60>, <4, -24>, <8, 0> ],
    [ <1, -20>, <2, 50>, <4, -22>, <8, 4> ],
    [ <1, -8>, <2, 20>, <4, -16>, <8, 16> ],
    [ <1, -16>, <2, 40>, <4, -20>, <8, 8> ]
];

