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allo
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Such things need to be clarified beforehand. Now you need to read the grading rules in detail, apply what is applicable, and probably do so in favor of the student.

For the next time, you should add a rule about this. A common rule is:

When more than one answer is given, the answers are not graded. Please make clear, e.g., by striking out the other answer, which answer should be graded."

allo
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