Here are my sample unit files extracted from my real ones. Firstly, here is an 
example of Service A:

        [Unit]
        Description=Service A
        After=network.target

        [Service]
        Type=notify
        NotifyAccess=all
        ...

        [Install]
        WantedBy=multi-user.target


Here is an example of Service B:

        [Unit]
        Description=Service B
        After=servicea
        BindsTo=servicea

        [Service]
        ...

        [Install]
        WantedBy=multi-user.target

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