1     ...........
 2    $2/,,,,$1...../
 3   $2/,,,$1..$2,,$1../   $2()
 4  $2/,,,,$1../
 5 $2/,,,$1.../     $1/'\
 6$2/,$1...../      $2\,/
 7$2\,,,,,,\\             $1_
 8 $2\,,$1....\\           $1/ \
 9  $1\...$2,$1..\\          $2\_/
10   $1\..$2,,,,,,,,,,,,/
11    $1\$2,,$1........$2,,/