It helps a little, but only on the [sigma] management level. Until recently, that was the only level and so it would have been fine. But now (as Waterhouse realizes through long contemplation during the hours when he should be breaking codes) a new factor has entered the system of equations that governs his behavior; he will have to write to Alan and tell him that some new instructions will have to be added to the Waterhouse simulation Turing machine. This new factor is F MSp , the Factor of Mary Smith Proximity.