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The transitive closure of the relation $\left\{(1, 2), (2, 3), (3, 4), (5, 4)\right\}$ on the set $\left\{1, 2, 3, 4, 5\right\}$ is ___________.

The transitive closure of the relation {(1,2),(2,3),(3,4),(5,4)} = {(1,2),(2,3),(1,3) ,(3,4),(2,4),(1,4),(5,4)}