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The four main types of coal are anthracite, bituminous, sub-bituminous, and lignite. Anthracite is the highest rank, known for its high carbon content and heating value. Bituminous coal is widely used for electricity generation and steel production, while sub-bituminous coal has a lower heating value and is primarily used in electricity generation. Lignite, the lowest rank, is soft and has a high moisture content, often used in electricity generation in regions close to mining sites.

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