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