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            f 1//1 2//2 3//3
            f 1//1 3//3 4//4
            f 1//1 4//4 2//2
            f 4//4 3//3 2//2
            f 5//5 6//6 7//7
            f 5//5 7//7 8//8
            f 5//5 8//8 6//6
            f 8//8 7//7 6//6
            f 9//9 10//10 11//11
            f 9//9 11//11 12//12
            f 9//9 12//12 10//10
            f 12//12 11//11 10//10
            f 13//13 14//14 15//15
            f 13//13 15//15 16//16
            f 13//13 16//16 14//14
            f 16//16 15//15 14//14