If a equals 100, what b, c, d, e and f fulfills the following, if any?
b < c
b < a / 2
c < a - b
c > a / 2
d = a - b - c
e < f
e < d / 2
f < d - e
f > d / 2
b < c
b < a / 2
c < a - b
c > a / 2
d = a - b - c
e < f
e < d / 2
f < d - e
f > d / 2
