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A Bounding Container which is in the shape of an octagon.
 The OctagonalEnvelope of a geometric object
 is tight along the four extremal rectilineal parallels
 and along the four extremal diagonal parallels.
 Depending on the shape of the contained
 geometry, the octagon may be degenerate to any extreme
 (e.g. it may be a rectangle, a line, or a point).
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