GGGGGGGGb  dP   .GGGGG.   dGGGGGGGP 
  GG         GG  dG'   `GG       .dG' 
 aGGaaaa     GG  GG            .dG'   
  GG         GG  GG   YPGG   .dG'     
  GG         GG  YG.   .GG  dG'       
  GGGGGGGGP  dP   `GGGGG'   YGGGGGGGP