Historical clue formulations

• Plural suffix? — 2019-06-09
• Plural suffix — 2015-04-25
• Plural suffix? — 2007-04-28
• Original finish? — 2007-04-08
• Suffix with odd — 2004-12-05
• Suffix with dual — 2004-10-24
• Suffix with superficial — 2003-09-28
• Suffix with theatrical — 1999-03-13