Corrective
Double Three
A complex correction consisting of two simple corrective patterns connected by one X wave, labeled W-X-Y. The components can be any combination of zigzags, flats, or triangles (triangle only as Y).
A complex correction consisting of two simple corrective patterns connected by one X wave, labeled W-X-Y. The components can be any combination of zigzags, flats, or triangles (triangle only as Y).