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

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

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

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

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