et A be the students {Tom, Jim, Lisa, Mary}, B be the courses {C100, C200, C300, C400}, C be the years {2010, 2011, 2012, 2013}. Let R be enrollment relation {(Tom, C200), (Jim, C400), (Lisa, C100), (Mary, C400)}. Let S be course offering relation {(C100, 2011), (C100, 2012), (C300, 2010), (C300, 2012), (C400, 2013)}. Find the enrollment year relation SoR. You must use arrow diagrams to find the answer.

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