(0 7 4)(1 18 2)(3 20 15)(5 10 8)(6 19 17)(9 13 11)(12 16 14)
ALLOWS (11/8)-SEQUENCE
1: (2 13 18)

(0 7 4)(1 18 11 9 13)(2)(3 20 15)(5 10 8)(6 19 17)(12 16 14)
2: (3 20 15)

(0 7 4)(1 18 11 9 13)(2)(3)(5 10 8)(6 19 17)(12 16 14)(15)(20)
3: (12 16 14)

(0 7 4)(1 18 11 9 13)(2)(3)(5 10 8)(6 19 17)(12)(14)(15)(16)(20)
4: (1 18 11)

(0 7 4)(1 9 13)(2)(3)(5 10 8)(6 19 17)(11)(12)(14)(15)(16)(18)(20)