English: Signature of Sukhuman (Sukhumala Marasri), Boriphat (Paribatra Sukhumbandhu), and Naphaphorn (Nabhabhorn Prabha) (naming in order from left to right, on the top row; the lower low is a bit unclear) - all of them Descendants of Mongkut - sculpted into the wall of Tham Phra Cave during their visit
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