Tag change to include [series:]

Background Pony #95A9
I’m doubting that’s how the prefix is supposed to be used. ych results and other YCH matters in general are not tagged with series:* tags very much. Overall, series:* tags seem to be for grouping works that aren’t quite a comic but are produced over time and have some kind of connection.
On the other hand, maybe the prefix is relatively new and simply hadn’t been in use for other YCH sets? (For example several from Sugar Morning)
EnderFloofs
Solar Guardian - Refused to surrender in the face of the Lunar rebellion and showed utmost loyalty to the Solar Empire (April Fools 2023).
Perfect Pony Plot Provider - Uploader of 10+ images with 350 upvotes or more (Questionable/Explicit)
Twinkling Balloon - Took part in the 2021 community collab.

The Butt Connoisseur
If series isn’t the correct tag prefix, then I’m more than happy to have that corrected. If there was a set: tag set that was also pink, that would make more sense, but series: seems like the best alternative.
I dunno.
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