\environment columnsets-000

\definecolumnset[example][n=3,page=left]

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

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

\definecolor[fakerulecolor][white]

\setupcolumnset[example:1][width=2cm]
\setupcolumnset[example:2][width=4cm]
\setupcolumnset[example:3][width=3cm]

\setupcolumnset[example:4][width=3cm]
\setupcolumnset[example:5][width=4cm]
\setupcolumnset[example:6][width=6cm]

\starttext

\startcolumnset[example]

\dorecurse{15}{
  \dorecurse{3}{\fakewords{10}{15}\par}
  \column[yes]
}

\stopcolumnset

\stoptext