\setuppapersize [A5][A4] \setuplayout [location=middle,marking=on] \setuppagenumbering [alternative=doublesided] \setupbodyfont [lbr,6pt] \setupheadertexts [alfa][beta] \setuplayout [headspace=1cm,lines=56,header=1cm,footer=0cm, backspace=1cm,width=middle,grid=yes] \showframe \showgrid \starttext \startcolumns[n=3] \dorecurse{10}{\input tufte \par \input knuth \par} \stopcolumns \stoptext