Since you're lazy, here's a bit of tasty stuff that comes right from its source.

"Rules:
Diagonals are always 5 wave structures.
Structure = 3-3-3-3-3 or 5-3-3-3-3
Leading Diagonals happen in Wave 1 of an Impulse or Wave A of a ZigZag.
Wave 2 & 4 always subdivide in ZigZag corrections.
Wave 2 Never moves beyond origin of Wave 1.
Wave 3 must go beyond Wave 1.
Wave 4 must move into wave 1 range but not beyond Wave 2.
Wave 5 must go beyond Wave 3, there should be no "Truncation".
In Contracting Diagonals, Wave 3 is always shorter than Wave 1, Wave 4 Shorter than Wave 2, and Wave 5 shorter than Wave 3.
In Expanding Diagonals, Wave 3 is always longer than Wave 1, Wave 4 longer than Wave 2, and Wave 5 longer than Wave 3.
"

I don't know who you are and what you know, but I know who you are not and what you don't know. Simple as that.