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6.00x students earn credit for submitting code to online checkers. Feedback is instant, but limited: A green checkmark appears if your code passes all test cases, otherwise it lists failed tests.
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6.00x students earn credit for submitting code to online checkers. Feedback is instant, but limited: A green checkmark appears if your code passes all test cases, otherwise it lists failed tests.

See Article: MOOCs: A review