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