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The hardness mark of the pencil lead is generally indicated by “H” for a hard pencil, “B” for a soft pencil, “HB” for a soft and hard pencil, and “F” for a pencil with a hardness between HB and H. Arrangement (from soft to hard) 9B, 8B, 7B, 6B, 5B, 4B, 3B, 2B, B, HB,…