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Find the symmetric closure over the set {a, b, c, d} for the relation {(a,a), (a,b), (b,c)}
{(a,a), (a,b), (b,c), (b,a), (c,b)}
{(a,a), (a,b), (a,c)}
{(a,a), (a,b), (b,c), (b,b), (c,c), (d,d)}
{(a,a), (a,b), (b,a), (a,c), (c,a), (a,d), (d,a), (b,c), (c,b), (c,d), (d,c)}
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