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Story Description
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The Grader should be able to view rubrics, on which marking of a submission is
based. Rubrics, their weight and descriptions should be visible to the Grader
throughout the process of marking a submission. The Grader assigns marks for
each rubric which the instructor has set up and those marks are saved in the
system.

Tests
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* Show that marks sum up appropriately
* Change marks, show that changes show up in overall marks of submission too