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- Block 1: Cylinders vary in breadth-that is, they proceed from thick to thin
- Block 2: Cylinders vary in both height and breath-that is, they proceed from large to small.
- Block 3: Cylinders vary in both height and breadth, but inversely. That is, they proceed from short and wide to tall and thin.
- Block 4: Cylinders vary only in height-that is, they proceed from tall to short.
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