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

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

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

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

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