$2                                                   __^
$2                                                __/    \
$2   MMy        dMy                            __/        \
$2  dMMy        MMy                            $1MM$2          \
$2  MMMy            ,,        $1dMMMMn                        $2\
$2 dMMy        dMM dMMMMMMy  $1dMM  MM dMMMMMy  dMM MM.nMMM dMMMMMM
$1MMM          $2MMy MMy  MMy $1dMM      MMy  MMy MMy MMy    dy   dMy
$1MMM         $2dMM dMM   MMy  $1dMMMMy dMM  dMM dMM dMM    dMMMMMMM
$2 dMMy       MMy MMy  MMy     $1dMMy MM  MMy MMy  MMy    dMM
$2dMMy       dMM dMM  dMM $1dMM  MMy dMMMMMy dMM  dMM     MMy   MM
$2MMMMMMMMMM MMy MMy  MMy $1dMMMyyy MMy     MMy  MMy      dMMMMMMy
$2                                $1dy