After the White rabbit reads the Pigeon's notes/riddle, the king says that that is 'the most important piece of evidence we've heard yet'. It is also stated later that the notes are a pun. I have tried to solve it as if it were a riddle, and also tried to see if it is a cipher or code, but no luck. The characters even go on to try to decipher the notes, albeit unsuccessfully. Has anyone else tried to find meaning in the pigeon's notes?