UPCS
| Date | Clue |
|---|---|
| 2023-01-13 | Supermarket lines, for short? |
| 2022-02-25 | Special bars for shoppers |
| 2021-06-07 | Lines at the cash register, for short? |
| 2020-10-16 | Supermarket IDs |
| 2018-12-16 | Scanned IDs |
| 2017-11-21 | Supermarket IDs |
| 2017-07-06 | Scannable symbols on store items, for short |
| 2016-04-02 | Market IDs |
| 2015-07-26 | Short lines at the checkout? |
| 2011-09-23 | Modern proofs-of-purchase, for short |
| 2008-02-20 | Food pkg. markings |
| 2007-06-30 | Proofs of purchase, often: Abbr. |
| 2004-12-25 | Short lines at a store: Abbr. |
| 2001-06-11 | They come in bars: Abbr. |