For fixed z and a=3, b>=a

For fixed z and a=3, b=3

For fixed z and a=3, b=13/4

For fixed z and a=3, b=15/4

For fixed z and a=3, b=4

For fixed z and a=3, b=17/4

For fixed z and a=3, b=19/4

For fixed z and a=3, b=5

For fixed z and a=3, b=21/4

For fixed z and a=3, b=23/4

For fixed z and a=3, b=6