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Hmm, interesting. I would guess it depends what you're writing about no? Do you have to keep the subjects quite different from each other to avoid confusion?

Cg

No, in fact it is the opposite. When you are working on two different characters and ideas, the structure you are working on, helps you to organize better the other process you have in your head. Is something like that

Very interesting; please follow up on this comment and let me know how it went when you are finished, or near completion.

Cg

I'm starting with this. The script process is usually long, but of course I'll tell you!