For the set A={Ø,{Ø},a,b,c} the power set contains the following 25=32 subsets:
P(A)={Ø,{Ø},{{Ø}},{a},{b},{c},{Ø,{Ø}},{Ø,a},{Ø,b},{Ø,c},{{Ø},a},{{Ø},b},{{Ø},c},{a,b},{a,c},{b,c},{Ø,{Ø},a},{Ø,{Ø},b},{Ø,{Ø},c},{Ø,a,b},{Ø,a,c},{Ø,b,c},{{Ø},a,b},{{Ø},a,c},{{Ø},b,c},{a,b,c},{Ø,{Ø},a,b},{Ø,{Ø},a,c},{Ø,{Ø},b,c},{Ø,a,b,c},{{Ø},a,b,c},{Ø,{Ø},a,b,c}}