Proper:
{ },{2},{4},{6},{8},{10},{2,4},{2,6},{2,8},{2,10},{4,6},{4,8},{4,10},{6,8},{6,10},{8,10},{2,4,6},{2,4,8},{2,4,10},{2,6,8},{2,6,10},{2,8,10},{4,6,8},{4,6,10},{6,8,10}, {2,4,6,8},{2,4,6,10},{4,6,8,10}, {2,4,8,10}
Improper:
{2,4,6,8,10}
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Answers & Comments
Proper:
{ },{2},{4},{6},{8},{10},{2,4},{2,6},{2,8},{2,10},{4,6},{4,8},{4,10},{6,8},{6,10},{8,10},{2,4,6},{2,4,8},{2,4,10},{2,6,8},{2,6,10},{2,8,10},{4,6,8},{4,6,10},{6,8,10}, {2,4,6,8},{2,4,6,10},{4,6,8,10}, {2,4,8,10}
Improper:
{2,4,6,8,10}
Check if it’s right