latex cdo_refcard
dvips -Ppdf -n 4 cdo_refcard
#ps2pdf cdo_refcard.ps cdo_refcard.pdf
pstops -pa4 '2:0R@.7(0.2cm,29.6cm)+1R@.7(0.2cm,15cm)' cdo_refcard.ps cdo_refcard2.ps
mv cdo_refcard2.ps cdo_refcard.ps
ps2pdf cdo_refcard.ps cdo_refcard.pdf
