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This exercise helps you learn the relative positions for executing an efficient cross solution for 3x3x3, and the order of cross pieces when using the Yau method.

It's also useful for determining the colour of the fourth face to solve on even-ordered big cubes (4x4x4, 6x6x6, 8x8x8, etc.), which don't have fixed center pieces.

The trainer uses the standard colour scheme, which is white top (U), yellow bottom (D), orange left (L), red right (R), green front (F), blue back (B).