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Goodreads asked Ulff Lehmann:

How do you deal with writer’s block?

Ulff Lehmann Everyone, I believe, has certain music, certain songs, that remind them of some passage of a book or film they enjoyed, listen to that. And don't let your own perfectionism get in the way, something, some sort of solution will present itself. If you reach a point in the story that won't go as planned, listen to your characters, they'll tell you where they want to go, and what they want to do.
Don't force it, however, and don't be afraid to say "fuck it" and do something else.

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