ASO
3 letters
Historical clue formulations
- Japan's largest active volcano — 2015-10-10
- Volcano on Kyushu — 2013-10-16
- Japan's largest active volcano — 2013-01-02
- Largest active volcano in Japan — 2012-11-17
- Active Japanese volcano — 2010-05-09
- Japanese volcano — 2010-03-21
- Japanese prime minister Taro ___ — 2009-11-17
- Japan's largest active volcano — 2008-08-06
- Very active Japanese volcano — 2006-05-11