Fix grammaticality in this sentence: These planes are not only a mark of development in speed but also in agility.
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The two-dimensional plane is a plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the plane of the