However, it develops that the only time color is significant is when we ask whether or not a given piece has its top color on top of the cube. All four pieces are in the correct order. Color is immaterial. Two pieces opposite each other are in the correct order. The other two pieces are also in the correct order relative to each other but are out of order relative to the first two pieces.
Color is immaterial.
Two pieces adjacent to each other are in order and the other two are out of order. Two pieces adjacent to each other are in order and the other two are out of order. Note that there are only four different combinations of the top corner pieces, including colors, which are significant. Each of the other three may be converted to arrangement 4 by a single Corner Piece Series. Although it is not necessary, many will find it easier to identify the arrangement of pieces when at least one of the pieces is in position.