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

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

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

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

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