Is it possible to connect more than two lines to a node?
Example: you have one line with three nodes, one on each end and one in the middle.  You have another line with two nodes, one on each end.  Is it possible to connect the line with two nodes to the line with three nodes at the middle node point?
(fixed width character diagram)
o----------o-----------o     o----------o-----------o
           o                            |
           |                            |
           |             ->             |
           |                            o