Graphviz Dot vertical alignment of nodes

I got this dot graph and want the nodes A and D, B and E and C and F to be aligned. Here is the related dot code:

digraph{

A
B
C
D
E
F

{rank = same; B; C}
{rank = same; E; F}

A -> B [label="2", weight=2]
A -> C [label="0", style=dashed, weight=2]
B -> C [label="0", style=dashed, weight=2]
B -> D [label="2", style=dashed, weight=2]
C -> D [label="0", weight=2]
D -> E [label="1", style=dashed, weight=2]
D -> F [label="0", weight=2]
E -> F [label="0", weight=2]
F -> A
}

As you can see I already tried to apply weights to the edges, but that didn't work out

enter image description here

Solution

It is possible to use the group attribute of the nodes to suggest aligning the edges between nodes of the same group in a straight line.

Declare the nodes with the group attribute:

A [group=g1]
{rank = same; B[group=g2]; C[group=g3]}
D [group=g1]
{rank = same; E[group=g2]; F[group=g3]}

Then make sure all of those nodes have an (invisible) edge between them:

edge[style=invis];
A -> D
B -> E
C -> F

Everything together:

digraph G {
  A [group=g1]
  {rank = same; B[group=g2]; C[group=g3]}
  D [group=g1]
  {rank = same; E[group=g2]; F[group=g3]}

  A -> B [label="2", weight=2]
  A -> C [label="0", style=dashed, weight=2]
  B -> C [label="0", style=dashed, weight=2]
  B -> D [label="2", style=dashed, weight=2]
  C -> D [label="0", weight=2]
  D -> E [label="1", style=dashed, weight=2]
  D -> F [label="0", weight=2]
  E -> F [label="0", weight=2]
  F -> A

  edge[style=invis];
  A -> D
  B -> E
  C -> F
}