iiiiiiiiiiiiiiii     
      iiiii11111111iii:i     
     ;;i1tffffffffffft1i     
     ;itffft1111111ttfti     
     itfff1;iiiiiii;iii;     
     itfft;;;;;  iii;;;;     
     ;1tft1i;;;;;;;;         
     ;;ittttt1ii;;:;;;       
      ;;;i1tttttt11i;:::     
       ;;;.;;ii11ttt1i;:     
         ;;;;;;:;;1ttt1;     
     ::::::   ;;::;1ttt;     
     :;::,::::::::;1tt1;     
     ;11iii;;;;;;i1111;:     
     :i1111111111111i:::     
     :::::;;;;;;;;:::::      
     ::::::::::::::::