Historical clue formulations

• Quenched — 2019-03-30
• Quenched — 2017-12-31
• Quenched — 2017-08-20
• Satisfied — 2016-02-13
• Quenched — 2015-02-03
• Quenched — 2008-03-31
• Quenched — 2008-02-20