1$2                                                   __^
 2$2                                                __/    \
 3$2   MMy        dMy                            __/        \
 4$2  dMMy        MMy                            $1MM$2          \
 5$2  MMMy            ,,        $1dMMMMn                        $2\
 6$2 dMMy        dMM dMMMMMMy  $1dMM  MM dMMMMMy  dMM MM.nMMM dMMMMMM
 7$1MMM          $2MMy MMy  MMy $1dMM      MMy  MMy MMy MMy    dy   dMy
 8$1MMM         $2dMM dMM   MMy  $1dMMMMy dMM  dMM dMM dMM    dMMMMMMM
 9$2 dMMy       MMy MMy  MMy     $1dMMy MM  MMy MMy  MMy    dMM
10$2dMMy       dMM dMM  dMM $1dMM  MMy dMMMMMy dMM  dMM     MMy   MM
11$2MMMMMMMMMM MMy MMy  MMy $1dMMMyyy MMy     MMy  MMy      dMMMMMMy
12$2                                $1dy