# https://github.com/mikedh/trimesh
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f 3//3 2//2 1//1
f 3//3 1//1 4//4
f 5//5 1//1 2//2
f 5//5 2//2 6//6
f 7//7 3//3 4//4
f 7//7 4//4 8//8
f 8//8 5//5 6//6
f 8//8 6//6 7//7
f 11//11 10//10 9//9
f 11//11 9//9 12//12
f 13//13 9//9 10//10
f 13//13 10//10 14//14
f 15//15 11//11 12//12
f 15//15 16//16 11//11
f 14//14 17//17 13//13
f 18//18 17//17 14//14
f 19//19 16//16 15//15
f 19//19 15//15 20//20
f 20//20 17//17 18//18
f 20//20 18//18 19//19
f 3//3 21//21 2//2
f 21//21 6//6 2//2
f 7//7 21//21 3//3
f 21//21 7//7 6//6
f 11//11 22//22 10//10
f 22//22 14//14 10//10
f 16//16 23//23 22//22
f 16//16 22//22 11//11
f 23//23 18//18 14//14
f 23//23 14//14 22//22
f 19//19 23//23 16//16
f 23//23 19//19 18//18