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Spawn multiple models in specific sequence

I have a launch file with which I'm able to spawn multiple models into gazebo. My Problem is, that I need a specific loading sequence. Meaning, that I want the last model to only load, when the other ones have already loaded.

This is needed because the last model to be loaded, has a plugin which tries to get a pointer to the other models, but fails, since they are sometimes not loaded.

How would I go about doing this?