Cities around the world follow Zipf's law. The second city is a certain percentage smaller, third smaller again etc.
With Dublin at 592,713, Zipf (α=1) predicts the second city should be around 296,000. Belfast is actually 348,005 — about 17% larger than the law would predict
Cork at 222,333 (rank 3) fits pretty well — Zipf predicts ~197k.
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