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