A) What number, by adding one letter, becomes a sound? B) What number, by adding two letters, becomes isolated?
C) What number, by inserting one letter, becomes finely ground meal?
D) What number, by subtracting one letter, becomes a plant?
E) What number, by subtracting one letter, becomes a preposition?
F) What number, by replacing one letter with another one, becomes a luminous object?
