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Вкажіть симетричне відношення
{ (a, a), (a, b), (a, d), (b, b), (c, c), (d, d), (b, a) }
{ (a, b), (b, b), (c, c), (d, d), (b, a), (d, a), (c, d) }
{ (a, a), (a, b), (a, d), (b, b), (c, c), (d, d), (b, a), (d, a) }
{ (a, a), (b, b), (c, c), (d, d), (a, b)}
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