.
      :    .
      |    :
      |    |
     _|____|____________        ________      ________        ____________
     \_______     \_   .|______/      _/_____/      _/_______/  _________/
     /|    |       /   :|      \_    :|      \_    :|      \_____    _   \_
   _/            //    .|       /    .|       /    .|       /    \__/|    /
   \______      //______      //______      //______      //______      //
     +tZ^\______/      \______/      \______/      \______/      \______/