Two drill-downs and two horizontal links
Stream A calls two other streams at two different steps, in drill-down mode.
One of these drill-down streams calls another stream through a horizontal link.
When stream A finishes, it also calls another stream through a horizontal link.
The link creation was as follows: first create the link between streams A and E,
and the link between streams C and D. Then stream A (already linked in horizontal mode)
was linked in drill-down mode to streams B and C (the latter also already linked in
horizontal mode).
The diagrams span two levels. In the animated HTML, you can animate only the highest
level (which includes the horizontal link only), or both levels.