The 1x3x3 is of course very easy. However this shape can be used in many of the other shapes.
The 1x3x4 also is an example of a shape that is used in many other shapes.
1 x 3 x 5 (2)
1 x 3 x 7 (6)
This is shown with another simple shape using the 1x3x3 and 1x3x4.
1 x 3 x 8 (2)
1 x 3 x 10 (2)
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