How to make a line point straight down

[elgatito]

more specifically the rightmost line on the image
code:

digraph {
    V0 -> Pro0
    V0 -> are
    V0 -> V1
    
    Pro0 -> we
    
    V1 -> trying
    V1 -> to0
    
    to0 -> to
    to0 -> V2
    
    V2 -> understand
    V2 -> N0
    
    D0 -> the
    
    N0 -> D0
    N0 -> difference
    
    subgraph cluster_sentence {
        node [ shape=plaintext ]
        we
        are
        trying
        to
        understand
        the
        difference
    }
}

[steveroush]

Added group to encourage vertical alignment and minlen to push Pro0 back to the top.

``
digraph {

Pro0 [group=A]  // group (usually) forces vertical edge
we   [group=A]

V0 -> Pro0
V0 -> are
V0 -> V1

Pro0 -> we  [minlen=5]  // minlen forces Pro0 up 5 ranks

V1 -> trying
V1 -> to0

to0 -> to
to0 -> V2

V2 -> understand
V2 -> N0

D0 -> the

N0 -> D0
N0 -> difference

subgraph cluster_sentence {
    node [ shape=plaintext ]
    we
    are
    trying
    to
    understand
    the
    difference
}

}
``
Giving: