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What is the covering relation of the partial ordering {(A, B) | A ⊆ B} on the power set of S, where S = {a, b, c}?

i’m getting

R={(Ф, {a}), (Ф, {b}), (Ф, {c}), (Ф, {a, b}), (Ф, {b, c}), (Ф, {a, c}), (Ф, {a, b, c}), ({a}, {a, b}), ({a}, {a, c}), ({b}, {b, c}), ({b}, {a, b}), ({c}, {b, c}), ({a}, {a, b}), ({a}, {a, b, c}), ({b}, {a, b, c}), ({c}, {a, b, c}), ({a, b}, {a, b, c}), ({b, c}, {a, b, c}), ({a, c}, {a, b, c}) }


but in Rosen answer gives is

(∅, {a}), (∅, {b}), (∅, {c}), ({a}, {a, b}), ({a}, {a, c}), ({b}, {a, b}), ({b}, {b, c}), ({c}, {a, c}), ({c}, {b, c}), ({a, b}, {a, b, c}), ({a, c}, {a, b, c})({b, c}, {a, b, c})

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