W–X–Y denotes two corrective structures connected by X. W–X–Y–X–Z denotes three structures with two connecting waves. The letters identify components at one degree, not any three or five convenient turning points.
What the letters contain
W, Y and Z are complete corrective forms. X is a connecting correction. Check each component’s internal structure rather than drawing a line between its endpoints.
An A–B–C zigzag has 5–3–5 subdivisions; a flat has 3–3–5. A triangle has five corrective legs A–B–C–D–E. Therefore “every component must be ABC” is too restrictive for combinations in general.
Double zigzag or double three?
A double zigzag connects two zigzags and generally extends a directional price correction. A double three combines simple forms and is typically more sideways, extending time. Both can use W–X–Y; the outer letters alone do not distinguish them.
In the classical description of sideways combinations, a triangle is permitted as the final actionary component, not an arbitrary intermediate insert. Connecting X waves are considered separately.
Triple forms are more complex and rare in the classical account. Complexity is not quality: first test whether a simpler valid form explains the movement.
Hypothetical check
If W is a completed zigzag, X a corrective rebound and Y another zigzag, the candidate is a double zigzag, not one ABC stretched by extra letters.
If Y merely appears as a decline without identifiable internal parts, a completed W–X–Y is not established. State a provisional interpretation and the missing evidence.
Common mistakes
Mixing degrees, calling a fast X an impulse, hiding major counter-moves within W or Y, and adding Z solely to preserve an expectation all undermine the analysis. A proposed correction endpoint is not a guaranteed reversal.
See Waveopedia: Combinations and Zigzags. These are descriptive rules, not evidence of profitability.