(0 19 17)(1 20 14 9 3)(2 15 10 7 4)(5 8 6)(11 18 16)(12 21 13)
ALLOWS (11/8)-SEQUENCE
1: (0 1 17)
(0)(1 19 17 20 14 9 3)(2 15 10 7 4)(5 8 6)(11 18 16)(12 21 13)
2: (14 17 20)
(0)(1 19 17 9 3)(2 15 10 7 4)(5 8 6)(11 18 16)(12 21 13)(14)(20)
3: (11 18 16)
(0)(1 19 17 9 3)(2 15 10 7 4)(5 8 6)(11)(12 21 13)(14)(16)(18)(20)
4: (9 19 17)
(0)(1 19 3)(2 15 10 7 4)(5 8 6)(9)(11)(12 21 13)(14)(16)(17)(18)(20)