一個游戲
the hardware for the game includes a number of displays, each with a butTon and
-- a light, that each represent a bin that can store marbles (beans).
--
-- The display indicates the number of marbles in each bin at any given time.
-- The light indecates that the present bin is not empty and that pushing the
-- butTon is a valid move in the game.
--
-- The butTon for each display indicates that a player takes the marbles from
-- the selected bin, and takes them in his hand. The hand is represented by a
-- diplay itself (no butTon).
--
-- Each player has a home bin, located on opposite sides of the game.
