 They had evidently been added to the book by a later hand.However, since in six of the pieces these entries matched texts that had, in the meantime, independently come to light in original manuscripts, it was hypothesised that the remaining three may, too, have been original, including texts for K. 231 ("Leck mich im Arsch" itself), and another Mozart work, "Leck mir den Arsch fein recht schön sauber" ("Lick my arse nice and clean", K. 233; K. 382d in the revised numbering).Later research revealed that the latter work was likely composed by Wenzel Trnka.