Dundee United went from UEFA Cup finalists to Scottish First division in 8 seasons, not quite as dramatic or steep though.
Didn't Swansea shoot up the divisions and slide back down in succession? MK Dons are another team. FA Cup winners in the 1980's, dropped from Premier Division to bottom flight in the space of a decade. I think Swindon had a fairly steep fall from Premiership to bottom flight too.
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