letters and must be at least 3 letters long.
boardspec is printed to stdout.
+          Allow a cube to be used multiple times, but not in succession.
++         Allow a cube to be considered adjacent to itself.
line by listing the board left to right and top to bottom, in lower case.
the game is given there.
words may scroll off the screen.
No word can contain a 'q' that is not immediately followed by a 'u'.
doesn't clearly indicate reused cubes.