The most frequent disagreement of the letter reversals has been over the Haha–Hung pair. The most convincing evidence suggesting this reversal is in the names of the letters: The unvoiced letter Haha is deep, while the voiced Hung, which suggests a lower position, is tall. This is often assumed to be a clerical error introduced in the rushed printing of the Shavian edition of "Androcles and the Lion". This reversal obscures the system of tall letters as voiceless consonants and deep letters as voiced consonants.