Why only 4 predominant patterns

In most cases, the user will see 4 predominant patterns. In some cases, only 3, 2 or even 1. Why?

At the back end, Market Memory’s proprietary algorithm will rank the importance and the relevance of the curves and only present the top 4. Mathematically speaking, these top 4 curves and their combinations will cover 99% cases. Of course, the Black Swan effect always exists in the market. However, we feel it will not bring too much value if we present more curves. In some cases, if top 3 can already cover ~ 99% cases, we will only present the top 3.