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A) 1, 3, 5; 2, 7; 4, 6
B) 2, 4, 5; 3, 7; 1, 6
C) 1, 6, 7; 2, 3; 4, 5
D) 1, 5; 2, 4, 7; 3, 6
Correct Answer: D
Solution :
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