digraph Parallel {
    graph [goal="Test parallel and fan-in execution"]

    start   [shape=Mdiamond]
    exit    [shape=Msquare]

    fork    [label="Fork Work", shape=component]
    branch1 [label="Branch 1"]
    branch2 [label="Branch 2"]
    merge   [label="Merge Results", shape=tripleoctagon]
    review  [label="Review"]

    start -> fork
    fork -> branch1
    fork -> branch2
    branch1 -> merge
    branch2 -> merge
    merge -> review -> exit
}