Nice one, Mark! Clever gridwork! At first I guessed "O the Maath" because I took 49d "slash" to mean subtract or take down (like at a store sale when they 'slash' prices). So I got an extra "a" at space 42. I thought it was dramatic but plausible. Had to visualize the "slash" symbol and say duh, he wants us to divide not substract! Hahaha.