elliott wave: the 5 wave up (or down) property of a zig zag

Theory says: a zig zag wave has a 5 (A) - 3 (B) - 5 (C) structure
This might sound obvious for some, but was a deadly trap for me:
- the 5 wave up/down structure of a zig zag does not folluw the same rules of a 5 wave structure of an impulse wave.