bbbbbbbb                                              dddddddd                  
          tttt           b::::::b                                              d::::::d                  
       ttt:::t           b::::::b                                              d::::::d                  
       t:::::t           b::::::b                                              d::::::d                  
       t:::::t            b:::::b                                              d:::::d                   
 ttttttt:::::ttttttt      b:::::bbbbbbbbb     rrrrr   rrrrrrrrr        ddddddddd:::::d  zzzzzzzzzzzzzzzzz
 t:::::::::::::::::t      b::::::::::::::bb   r::::rrr:::::::::r     dd::::::::::::::d  z:::::::::::::::z
 t:::::::::::::::::t      b::::::::::::::::b  r:::::::::::::::::r   d::::::::::::::::d  z::::::::::::::z 
 tttttt:::::::tttttt      b:::::bbbbb:::::::b rr::::::rrrrr::::::r d:::::::ddddd:::::d  zzzzzzzz::::::z  
       t:::::t            b:::::b    b::::::b  r:::::r     r:::::r d::::::d    d:::::d        z::::::z   
       t:::::t            b:::::b     b:::::b  r:::::r     rrrrrrr d:::::d     d:::::d       z::::::z    
       t:::::t            b:::::b     b:::::b  r:::::r             d:::::d     d:::::d      z::::::z     
       t:::::t    tttttt  b:::::b     b:::::b  r:::::r             d:::::d     d:::::d     z::::::z      
       t::::::tttt:::::t  b:::::bbbbbb::::::b  r:::::r             d::::::ddddd::::::dd   z::::::zzzzzzzz
       tt::::::::::::::t  b::::::::::::::::b   r:::::r              d:::::::::::::::::d  z::::::::::::::z
         tt:::::::::::tt  b:::::::::::::::b    r:::::r               d:::::::::ddd::::d z:::::::::::::::z
           ttttttttttt    bbbbbbbbbbbbbbbb     rrrrrrr                ddddddddd   ddddd zzzzzzzzzzzzzzzzz