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1) { }
2) {a}
3) {b}
4) {c}
5) {d}
6) {a,b}
7) {a,c}
8) {a,d}
9) {b,c}
10) {b,d}
11) {c,d}
12) {a,b,c}
13) {a,b,d}
14) {a,c,d}
15) {b,c,d}
16) {a,b,c,d}