printing slides

For important texts, I prefer to print them on paper and read in peace. The last time I did it was for the XTech 2006 slides. Unfortunately, I didn't find how to print several slides on page in ooimpress, so I implemented a workaround:

1) export slides to PDF (File->Export),
2) convert to PostScript (pdftops),
3) put several pages onto one page (pstops).

Experiments are required to write a correct specification for pstops. I used the following:

@#!@#@! I've already deleted it.