Apply the topological sorting algorithm to the given set S and partial order R, and give the sequence in which the elements of S are chosen.
S = {1, 2, 3, 4}, and R = {(1, 1), (2, 2), (3, 3), (4, 4), (1, 3), (2, 4), (4, 3), (2, 3)}.
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