"People who are great at dealing with not knowing are more successful than people who know a lot. -- Ray Dalio"
The AB=CD Pattern is part of Harmonic patterns and related to ABC patterns. After completing defined ratios in of C retracement ratios like 0.618 to 0.786, BC projections are computed. The projections from C (in CD leg) are 1.27 and 1.618 BC levels. These ratios wotk with both Price and Time levels.