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

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

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

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

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