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