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To access an element of a multidimensional array, you specify each index in its own pair of brackets. For example, to access the closing price on the second day, you write the following:

     *-- Row index, closing price (0 is the low, 1 is the high) 
     v   
djia[2][1]; 
        ^ 
        *-- Column index, second day (0 would be first day)