------------------------------------------------
 --1-2-3---1-2-3---1-2-3-1-3-4-3---1-2-3---1-2-3-
 3-------3-------3---------------3-------3-------
 ------------------------------------------------

 ------0-1-3-5-3-1-----5-4-3-1-------
 ----3-------------3-----------3-1-0-
 --3-----------------3---------------
 1-----------------------------------