For fixed z and a=2, b>=a

For fixed z and a=2, b=2

For fixed z and a=2, b=9/4

For fixed z and a=2, b=11/4

For fixed z and a=2, b=3

For fixed z and a=2, b=13/4

For fixed z and a=2, b=15/4

For fixed z and a=2, b=4

For fixed z and a=2, b=17/4

For fixed z and a=2, b=19/4

For fixed z and a=2, b=5

For fixed z and a=2, b=21/4

For fixed z and a=2, b=23/4

For fixed z and a=2, b=6