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dimensions of b1 paper
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dimensions of b1 paper, b1 paper size in cm, iso b1 paper size, a1 vs b1 paper size, dimensions of b4 paper, size b paper dimensions, b-1 paper, size of b paper, b-1b paper, what size is b1, what size paper is b2, b series paper sizes, b paper sizes inches, how big is b2 paper, how big is size b paper
