Perfect situation in Wave5 The Butterfly Pattern Summary: 1. Minimum AB=CD completion with Alternate 1.27 AB=CD pattern most common.Maximum 1.62 AB=CD 2. C point retracement can vary between a 0.382 to an 0.886, although 0.618 is preferred. 3. BC projection can vary from 1.13 to 3.618 and depends upon the C point retracement. 4. Alternate AB=CD patterns are common within the structure.