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"Orientation" is what gets flipped when a shape is mirrored.
Left examples have the keyword "handed" on the OEBP.
If mirroring any example along the any axis can change its sorting the BP is "handed."
For a BP to be a left example here it must not only relate to orientation, but furthermore the given orientation of its examples must be essential to parse the solution.
Note that BPs about comparing orientation between multiple things in one example fit on the right side. | 
