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Wikipedia says ( https://en.wikipedia.org/wiki/Power_set ) :
In mathematics, the power set (or powerset) of any set S is the set of all subsets of S, including the empty set and S itself.
Therefore,
P(S) = { {empty_set}, {a}, {b}, {c}, {a,b}, {a,c}, {b,c}, {a,b,c} }.
Answered and solved.