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This is more commonly known as 'writer's block', and the solution is simple: Write about something else, on a separate piece of paper (or separate file if you're typing). Write about whatever comes...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27663 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/