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Option 2 : 1, 5, 3; 2, 7, 8; 4, 6, 9
Diagrams 1, 5, 3 have 2 rectangles and a shaded part.
Diagrams 2, 7, 8 have a semi circle and a trapezium.
Diagrams 4, 6, 9 have a star and a circle.
Hence, the grouping can be done as 1, 5, 3; 2, 7, 8; 4, 6, 9.
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