power set for S= {b,c,f}
The power set P is the set of all subsets of S including S and the empty set ∅.
Since S contains 3 terms, our Power Set should contain 2^3 = 8 items
Link to power set for this problem
P = {{}, {b}, {c}, {f}, {b,c}, {b,f}, {c,f}, {b,c,f}}