a
b
c
d
e
f
g
h
i
j

(a<=>(j*a))*(b<=>(-i+-b))*(c<=>(h*c))*(d<=>(-g+-d))*(e<=>(f*e))*(f<=>(-e+-f))*(g<=>(d*g))*(h<=>(-c+-h))*(i<=>(b*i))*(j<=>(-a+-j))