```
```digraph {
concentrate=true;
problem [ shape=record, label="<p1>p1|<p2>p2|<p3>p3" ]
subgraph { rank=source; source }
some -> problem:p1
source -> problem:p2
source -> problem:p3
}

removing concentrate=true; solve lost of the edge

[erg] This is another old one, going back to 1.7 (July 2001). Since 1.7 doesn't accept anonymous subgraphs, one gets the same effect by adding an edge source->some. If the ports are removed, no trouble is reported but only one edge is drawn from source to problem.

```
digraph G {
concentrate=true;
a -> 4 -> b
a -> b
a -> b
}
```

```
```

This is probably the same as bug 203.