I am thinking too hard about this problem, I'm sure.

node 1 has two children nodes 2 & 4
node 2 has one child, node 3

paths are set up between each possible pair.

What should the listen look like?

store listen (origin=1, receiver=2, provider=1);
store listen (origin=2, receiver=1, provider=2);
store listen (origin=1, receiver=4, provider=1);
store listen (origin=4, receiver=1, provider=4);
store listen (origin=2, receiver=3, provider=2);
store listen (origin=3, receiver=2, provider=3);

Should there also be:

store listen (origin=1, receiver=3, provider=2);
store listen (origin=3, receiver=1, provider=2);

Thanks for your help.  I'm concerned I'm missing
something basic.
--elein