dGGGGGGP  dP    dP  dGGGGGGGP   GGGGGGGGb 
    GG     YG.  .GP       .dG'   GG        
    GG      YGaaGP      .dG'    aGGaaaa    
    GG        GG      .dG'       GG        
    GG        GG     dG'         GG        
    dP        dP     YGGGGGGGP   dP