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- divided into four main categories: biomass (MF1), metal ores (MF2), non-metallic minerals (MF3) and fossil energy carriers/materials ... are grouped into four main categories: biomass (MF1), metal ores (MF2), non-metallic minerals (MF3) and fossil energy carriers/materials ...38 KB (5,722 words) - 10:10, 19 July 2024