[sv-bc] Question on foreach loop

I am having a little difficulty understanding one of the foreach loop
examples in section 10.5.3 of the LRM.

  bit [3:0][2:1] B [5:1][4];
  foreach( B [ q, r, , s ] ) ...

The LRM states: "The second foreach causes q to iterate from 5 to 1, r from
0 to 3, and s from 2 to 1 (iteration over the third index is skipped)".

I do I read or write into the array if the third index is "skipped"?  It is
illegal to skip the third index when accessing the array (i.e.:
B[q][r][][s]), so of what value is skipping one of the iterators?

Stu
~~~~~~~~~~~~~~~~~~~~~~~~~
Stuart Sutherland
stuart@sutherland-hdl.com
+1-503-692-0898