Er, see the document you've linked to in the question.
If by "sample" you mean "trial" or "example", then yes, you can get evaluation licences that allow you to try out the software for free. These simply expire after a set time (but still allow enough access to allow you to put in a full licence later)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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