Encountering problems with explore data function

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My Code:

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What I expected to happen:
I would like to ask a question regarding the definition of explore data function. I do not understand what does ‘’ recall that the function assumes the argument for the dataset parameter doesn’t have a header row’’ mean and why is rows and column parameter is defualted as false while it says below in the description that we want to know the number of rows and columns when it is true.

What actually happened:

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