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coal pit▼◼◼◼
colliery [collieries]▼◼◼◻noun[UK: ˈkɒ.ljə.ri] [US: ˈkɒ.ljə.ri]
coal mine [coal mines]▼◼◼◼noun[UK: kəʊl maɪn] [US: koʊl ˈmaɪn]
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