For fixed z and a=17/4, b>=a
For fixed z and a=17/4, b=35/8
For fixed z and a=17/4, b=37/8
For fixed z and a=17/4, b=39/8
For fixed z and a=17/4, b=41/8
For fixed z and a=17/4, b=43/8
For fixed z and a=17/4, b=45/8
For fixed z and a=17/4, b=47/8