Can we avoid sentinel insertion by going backwards?
Game -> board
Orientation calculus
Word abstractions (in service of crosschecking)
Board -> game
Player abstraction
Move abstraction
Scores -> lexicon
Scrabble-score calculus
Make-scrabble-game
Use the lexicon.
Inchoate scrabble-constructor
Inchoate scrabble-player
Failure-threshold?
Inchoate game-player
"Dag" is really a lexicon.