<unk> <unk> <unk> <unk> <unk>  Passage: In Sweden, a four-hole national standard is almost exclusively used. The centers of the holes are 21 mm, 70 mm and 21 mm apart. The guides help keep the paper in a straight line.<unk> The guides help keep the paper in a straight line.  Question: How many holes is national standard in Sweden? (Question: How many holes is national standard in Sweden?)
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