Hi there I want to have a uml sequence diagram with dot language, now I have the following problem I want to have the layout as follows with a, b, c and d in a straight line at top but with the lines going straight to the bottom. How can I achieve that?
a b c d
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perhaps can I achieve that the a, b, c and d with its belonging edges are clusters where I set a different rankdir for the clusters?
EDIT Just found a solution by adding invisible edges between a, b, c and d but any other solutions?