flowchart TB
    subgraph Alpha
        A1[Short]
        A2[A very wide label that forces the subgraph border to be wide]
        A3[Short]
        A1 --> A2 --> A3
    end
    subgraph Beta
        B1[Short]
        B2[Short]
        B3[Short]
        B1 --> B2 --> B3
    end
