\environment columnsets-000

\definecolumnset[example][n=4,page=left]

\setupbackgrounds[text][text][background=contrast]

\setupcolumnset[frame=on,framecolor=color-4,rulethickness=1mm]

\definecolor[fakerulecolor][white]

\setupcolumnset[example:1][width=.3\makeupwidth]

\starttext

\startcolumnset[example]

  \fakewords{150}{150}
  \column
  \fakewords{25}{50}

  \dorecurse{25}{\fakewords{50}{75}\par}

\stopcolumnset

\stoptext