11111tttttttttttttt   
       1fffffffffffffffft1   
       1LLLLLLLLLLLLLLLLf1   
       1111111fLLLf1111111   
       1111111tLLLt1111111   
              tLLLt          
              tLLLt          
              tffft          
              tffft          
   ;;;;;;     1ffft          
   iiiiii    ;1fff1          
   itfft;;;;;L1fff1          
   itffti;,:;itffti          
   iitfftt11ttffti;          
   ;;;1tttttttt1i;;          
    ;;;;;iiiii;;;;           
      ;;;;;;;;;;;