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Greek Σ lowercases to σ, but a word-final sigma is written ς and is equally a lowercase of it, so a class built only from the character in hand knew one spelling of two. Each class now also carries the uppercase form's own lowercase, which reaches the other one. One-way on purpose: σ → Σ → σ never arrives at ς. Left so because ς is only correct at the end of a word, which is exactly where the request's last character sits — the pair that occurs in real titles is covered, and closing the other direction needs a fold table. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>