Answer:
1.{a,b,c,d}
2.{a,b,c},{b,c,d},{c,d,a},{a,b,d}
3.{a,b}{a,c}{a,d}{b,c}{b,d}{c,d}
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Answer:
1.{a,b,c,d}
2.{a,b,c},{b,c,d},{c,d,a},{a,b,d}
3.{a,b}{a,c}{a,d}{b,c}{b,d}{c,d}