Changes

* guide the reader, step by step, to learn certain points considered fundamental by experienced people.

* useful when users are studying how to use ConTeXt.

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* answering questions that reader with some experience would have.

* useful when users are working with ConTeXt.

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* explanations for clarifying a particular topic

* useful when users are studying how to use ConTeXt

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* technical descriptions which do not attempt to explain concepts or achieve tasks

* useful when users are working with ConTeXt

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