[NTG-context] Printing 3 din lang pages on one dina4 page

Hi, I managed to print din long flyers (100mmx210mm with 97mmx210mm fold page) with 6 pages using a lot of pageshifts etc. But how can I print one simple din long page (99mmx210mm) three times on a din a4 page so that I can cut it myself? The following does not work. \definepapersize [flyer] [width=99mm,height=210mm] \setuppapersize [flyer] [a4] \setuparranging[1*3] The option [1*3] does not exist for \setuparranging. But I thought this could be what I want one sheet three pages. TIA juh