The duped metric measures, for students who submitted more than one submission to an exercise, how many of those students saw a duplicated SCT error message. 

The duped metric is an "internal" metric, in the sense that the Content Quality and Engineering teams are responsible for it, as it directly measures the quality of SCTs, as written by Content Developers and Content Quality. 

However, it can be informative; analysis revealed that a high duped metric is correlated with both a high '% asked hint' and high '% asked solution.'

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