M20:=[
    [ <1, 0>, <2, 2>, <4, -4>, <5, 0>, <10, -10>, <20, 20> ],
    [ <1, -13>, <2, 29>, <4, -10>, <5, 9>, <10, -9>, <20, 2> ],
    [ <1, -20>, <2, 50>, <4, -20>, <5, 4>, <10, -10>, <20, 4> ],
    [ <1, 7>, <2, -3>, <4, -2>, <5, -3>, <10, -1>, <20, 10> ],
    [ <1, 0>, <2, 0>, <4, 0>, <5, 0>, <10, -8>, <20, 16> ],
    [ <1, -16>, <2, 40>, <4, -16>, <5, 0>, <10, 0>, <20, 0> ],
    [ <1, 2>, <2, -1>, <4, -1>, <5, -2>, <10, -3>, <20, 13> ],
    [ <1, 5>, <2, -2>, <4, -1>, <5, -1>, <10, -6>, <20, 13> ],
    [ <1, -14>, <2, 37>, <4, -15>, <5, 6>, <10, -9>, <20, 3> ],
    [ <1, -14>, <2, 33>, <4, -13>, <5, 6>, <10, -5>, <20, 1> ],
    [ <1, -8>, <2, 20>, <4, -8>, <5, 8>, <10, -4>, <20, 0> ],
    [ <1, -12>, <2, 26>, <4, -10>, <5, 12>, <10, -10>, <20, 2> ]
];

