7. Group the given figures into three classes using each figure only once.
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A. 1,5,9 ; 3,6,2 ; 4,7,8
B. 1,9,7 ; 2,8,5 ; 3,4,6
C. 1,3,5 ; 2,4,6 ; 7,8,9
D. 1,2,3 ; 4,5,6 ; 7,8,9
