Historical clue formulations

• Start of many souvenir slogans — 2025-03-04
• Start of many a T-shirt slogan — 2023-03-12
• Start of some souvenir shirt slogans — 2022-03-03
• Start to many bumper stickers — 2018-03-25
• Start of many a bumper sticker — 2011-12-29
• Start of many a bumper sticker — 2011-04-29