Hello all,

I am trying to lay out a page that has a 2/3 column split, and then
nest another set of 3 columns inside the larger of the two outer
columns. In case that's not clear, I've attached a PNG that shows
approximately what I would like to achieve.

Here's what I've tried:

```
\defineparagraphs[TwoThirds][n=2]
\setupparagraphs[TwoThirds][1][width=0.33\textwidth]

\starttext

\startTwoThirds

\input tufte

\nextTwoThirds

\input tufte

\startcolumns[n=3]
\input tufte
\stopcolumns

\stopTwoThirds

\stoptext
```

Instead of doing what I described, it made the contents of that inner
column very narrow, but does not split it across columns. The \column
command seems to have no effect.

Thank you for your help,

Walter