which set of lead grades has a grade out of sequence
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Which set of lead grades has a grade out of sequence?
A) H, HB, B, 3B
A) H, HB, B, 3BB) 7B, H, F, 3H
A) H, HB, B, 3BB) 7B, H, F, 3HC) 6B, B, H, 4H
A) H, HB, B, 3BB) 7B, H, F, 3HC) 6B, B, H, 4HD) 9H, HB, B, 2B
ANS: B
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