Worldtally country flag sprite
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The file `flags-sprite.webp` is a rendered sprite of country flags from
Flagpedia.net (served as flagcdn.com). Flagpedia states that its flag images are
public domain and free for commercial and non-commercial use:

https://flagpedia.net/download

No attribution is required. The flags are ordered to match Worldtally's country
list; the 64x48 tiles are cropped from Flagpedia's 320px-wide images.