"Besides, if I'm only a sort of thing in his dream, what are you, I should like to know?" "Ditto," said Tweedledum. "Ditto, ditto!" cried Tweedledee.
1871 December 27 (indicated as 1872), Lewis Carroll [pseudonym; Charles Lutwidge Dodgson], “Tweedledum and Tweedledee”, in Through the Looking-Glass, and What Alice Found There, London: Macmillan and Co., page 82