iiiiiii         iii;;;;   
   1ttttii        iiitttti   
   1ffffti;      ;;itffffi   
   1fffffti;    ;;itffffti   
   1ffffff1;;  ;iitfffffti   
   1fffffff1;;;;1tfffffft;   
   1ffft1tft1;;1tfft1tfft;   
   1ttt1;1ttt11tttti;tttt;   
   ittt1;;itttttt1;;;tttt;   
   ittt1 ;;itttti;;;;ttt1;   
   ittti  ;:;iii:;; ;ttt1;   
   ittti   ::::::   ;1tt1;   
   ittti    ::::    ;1tt1:   
   i111i            ;1111:   
   ;111i            :1111:   
   :;;;:            :;;;;:   
   :::::            ::::::