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1. {}
2. {E}, {X}, {O}
3. {E,X} {E,O},{X,O}
4. {E,X,O}
b.
1. {1},{2},{3},{4}
2. {1,2}, {1,3},{1,4},{2,3},{2,4}, {3,4}
3. {1,2,3}, {2,3,4}, {3,4,1}, {4,1,2}
4. {1,2,3,4}