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

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

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

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

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