1. 1, 5, 8;  2, 6, 7;  3, 4, 9
  2. 1, 5, 3;  2, 7, 8;  4, 6, 9
  3. 1, 7, 8;  2, 6, 9;  3, 4, 5
  4. 1, 5, 8;  2, 4, 7;  3, 6, 9
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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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