M4:=[
    [ <1, 32>, <2, -20>, <4, 8> ],
    [ <1, 0>, <2, -20>, <4, 40> ],
    [ <1, 8>, <2, -20>, <4, 32> ],
    [ <1, 16>, <2, -20>, <4, 24> ],
    [ <1, 40>, <2, -20>, <4, 0> ],
    [ <1, 24>, <2, -20>, <4, 16> ]
];

