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