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Help link for vector input

    1: \label{Some Items Were Not Submitted}
    2: This message means that some of the required items were not provided. The problem might expect you to fill out multiple answer fields, or you might have missed to select an option
    3: for one of the statements.
    4: 
    5: If this is a numerical or math problem, you likely received this message because you were required to enter a vector. Here are some examples and how they need to be entered:
    6: \[\left({17}\atop{42}\right)\]
    7: Enter: \verb|17,42|
    8: \[\left({17}\atop{42}\right)\frac{m}{s}\]
    9: Enter: \verb|17,42 m/s|
   10: \[\left({a^2}\atop{b^4}\right)\]
   11: Enter: \verb|a^2,b^4|