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  For fixed z and a=15/4, b>=a
  
 For fixed z and a=15/4, b=15/4 
 For fixed z and a=15/4, b=4 
 For fixed z and a=15/4, b=17/4 
 For fixed z and a=15/4, b=9/2 
 For fixed z and a=15/4, b=19/4 
 For fixed z and a=15/4, b=5 
 For fixed z and a=15/4, b=21/4 
 For fixed z and a=15/4, b=11/2 
 For fixed z and a=15/4, b=23/4 
 For fixed z and a=15/4, b=6 
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