Maple Issues: Marking DNE Answers

Some questions require an answer like dne (Does Not Exist). You cannot just compare $RESPONSE to a string like "dne". This is because $RESPONSE has hidden characters and so is not what it appears to be. This code will strip out those chatacters and allow the comparison:

The code checks for upper or lower case. The following comparison is actually stronger, it will catch mixed-case answers like "Dne":

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