I have made some efforts in Explaining one must have view of Preferred Pattern and alternative pattern
Even R N Elliott have Given the detailing on it , Wave Theory is a Method to Gauge the Market which represents self similarity patterns in the Market
those which have Higher % of repeating are called Preferred pattern and those which are Less repeating are called alternative Pattern
This video highlights the alternative pattern pan Out
one must wait for Proper set up to form before taking any decision of Trade
Good luck