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Explain the difference between pencils with no lead, one pencil, two pencils, and three pencils.

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Explain the difference between pencils with no lead, one pencil, two pencils, and three pencils.
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Pencil lead comes in various hardnesses, and there are many more than 3 ratings.. . Softer lead, makes a darker, wider mark. Lighter lead makes a lighter, thinner mark.
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Hardness of the graphite lead.
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the thickness of the lead
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