There's a possibility that someone was dumb and is actually using a seed with a simple repeating spurred or phrase, like "bacon" repeated 12 times results in a valid seed with checksum. I've actually thought of looking for one...

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bacon bacon bacon bacon bacon bacon bacon bacon bacon bacon bacon bacon nasty banana nasty banana nasty banana nasty banana nasty banana nasty banana one two three fork one two three fork one two three fork etc. I am sure the checksums aren't all correct on those, but you get the idea.