The X-A leg is generated by an initial price swing in one direction.
The market forms the B if it touches at least a 50% retracement of the XA and it does not touch a 61.8% retracement of the XA.
The market forms the C if it touches at least a 38.2% retracement of the AB and it does not exceed the A.
The Market forms the D (completion point) by fulfilling an 88.6% retracement of the XA.
If