Historical clue formulations

• Markdown indicator — 2024-08-11
• Kind of sale — 2020-04-08
• Sale indicator — 2018-08-24
• Markdown marker — 2014-12-14
• Sale item attachment — 2014-08-20
• Sale markdown indicator — 2007-08-28
• Put on sale — 1999-12-31
• Kind of sale — 1998-07-05
• Sale indicator — 1998-01-10
• Kind of sale — 1997-10-12