Starting from the pdf A2 format object, crop it with either `pdftilecut` or with `pdfposter`.
* See the `pdftilecut` github page for examples and source code, or consult the man page for `pdftilecut` once installed.
* If you decide to use `pdfposter` to tile your pdf file:
`$ pdfposter -s4 infile.pdf outfile.pdf`
Both solutions are cli.