Historical clue formulations

• "Ooh, that could work!" — 2022-11-16
• "Great thinking!" — 2022-01-11
• "Why didn't I think of that!" — 2021-03-01
• "You're clever!" — 2018-05-10
• "Oh, that's clever!" — 2016-05-01
• "Oh, that's brilliant!" — 2016-01-23