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Niech TD = (U, C, D), to tablica decyzyjna, gdzie C = {a, b, c, d, e} to zbiór atrybutów warunkowych, a D={f} to atrybut decyzyjny.
Niech zbiór reduktów to Read(A) = {{a, c, e}, {c, d, e}, {b, c, e}}.
Wówczas rdzeń zbioru atrybutów A to: