I believe at one point Dowolff described Hoshi wo Miru Hito's password system as one since it's 40 characters and those characters include: - all katakana - all hiragana - capital roman letters A-Z - numbers 1-9 - the copyright symbol for some reason
- all katakana
- all hiragana
- capital roman letters A-Z
- numbers 1-9
- the copyright symbol for some reason