<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: What numbers make up the national four hole standard?
21 mm, 70 mm and 21 mm