Japanese writing system
Collation

Collation (word ordering) in Japanese is based on the kana, which express the pronunciation of the words, rather than the kanji. The kana may be ordered using two common orderings, the prevalent gojūon (fifty-sound) ordering, or the old-fashioned iroha ordering. Kanji dictionaries are usually collated using the radical system, though other systems, such as SKIP, also exist.
language:response_language[Italian], combination:two_responses, oulipo:avoid_letter[o]