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

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

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

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

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