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func Challenge(g *game.Game, rng *rand.Rand)

func DrawBoard(b *board.Board)

func DrawGame(g *game.Game, players []Player)

func DrawRack(r tile.Rack)

func DrawStats(g *game.Game, players []Player)

func ExchangeTiles(letters string, g *game.Game, rng *rand.Rand)

func LettersToPlacements(rowDir, colDir, row, col int, letters string, rack tile.Rack, b *board.Board) play.Tiles

func LettersToRackTiles(letters string, rack tile.Rack) (tiles []tile.Tile)

func Pass(g *game.Game)

func PlayTiles(dir, row, col, letters string, g *game.Game)

func ShuffleRack(g *game.Game, rng *rand.Rand)