Answer:
2.{},{x},{y},{x,y}
3.{},{1},{2},{8},{1,2},{1,8},{2,8},{1,2,8}
4.{},{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,b,d},{a,c,d},{b,c,d},{a,b,c,d}
5.{},{a}
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Answers & Comments
Answer:
2.{},{x},{y},{x,y}
3.{},{1},{2},{8},{1,2},{1,8},{2,8},{1,2,8}
4.{},{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,b,d},{a,c,d},{b,c,d},{a,b,c,d}
5.{},{a}