Even now, in the digital age, there is hardly a person who has not seen a sheet of paper. All of us have dealt with the most common format - A4. Those who drew wall newspapers at school or studied drawing at the institute got acquainted with A3, A2 and A1. And owners of sets of recording paper can sometimes find information on the package that the size of one sheet is presented in A6 or A7 format. Some have heard that paper sizes can be presented in B and C.
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