Question: Now, we have four students: A, B, C and D. Each of them wants to randomly pick the data from a year to look into.

Now, we have four students: A, B, C and D. Each of them wants to randomly pick the data from a year to look into. (Let's say the years covered are 29 years). More than one person studying the data of the same year is allowed. How many possible outcomes can we have?

(This question is from permutation and combination unit)

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