2, 5, 6 contain two mutually perpendicular lines dividing the figure into four parts.
4, 7, 8 have two similar elements (unequal in size) attached to each other.
3, 4, 7 are all four-sided figures.
2, 5, 8 are all five-sided figures.
4, 5, 6 are figures composed of three straight lines.
7, 8, 9 are figures composed of four straight lines.
2, 5, 8 are all three-dimensional figures.
3, 6, 9 are all (two-dimensional) triangles.
2, 4, 8 have one element placed inside a different element.
3, 6, 9 have two similar elements, one inside the other and the area between the two elements is shaded.
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