\setuppapersize [A5][A4] \setuplayout [location=middle,marking=on] \setuppagenumbering [alternative={singlesided,doublesided}] \setupbodyfont [lbr,6pt] \setupheadertexts [alfa][beta][gamma][delta] \showframe \starttext \dorecurse{10}{\input tufte \par \input knuth \par} \stoptext