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In page Writer:

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As well as producing their own written works, writers often write about how they write (their writing process);[3] why they write (that is, their motivation);[4] and also comment on the work of other writers (criticism).[5] Writers work professionally or non-professionally, that is, for payment or without payment and may be paid either in advance, or on acceptance, or only after their work is published. Payment is only one of the motivations of writers and many are not paid for their work.[citation needed]