(+3,+2,+1,+4,+7,+6,+5,+8)
(+1,-4),(+6,-5)
(-7,+4),(-4,-5)
(-6,+7),(+5,-8)
(-4,-7),(-2,+3)
(-1,+2),(-3,+8)
(+1,+6),(-2,-7)