For the analysis of Chan theory走势, it can be used to prove the theorem of completeness of the Chan theory market up-and-down system: any up move and any down move in the market must necessarily begin and end with one of the three types of buy/sell points. In other words, the market’s price action is entirely composed of such price action; the endpoint of the price action is one of the three types of buy/sell points at some level.
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