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The Basic mode also introduces the concept of the subtract operation. This operations can be very useful to make holes and rounded shapes. For example, in the image below there is a block and a cylinder.

To make a hole in the block you can use the subtract operation. In the first section of the block include the object that should be visible and in the second section include the objects that should be subtracted.

Now add a move statement along the red axis to move the hole closer to the edge.

Add a move statement alond the blue axis to lift the cylinder. The resulting shape looks like a seat.