What does the HH Center LL of Tangqi 'an Road mean in futures?

This is the opening passage of tang qi Ann Passage.

HH:HHV(H，20)； LL:LLV(L，20)； From this, it is concluded that the opening signal of Tang channel is: long position: the price breaks through the highest price of the last 20 K lines, and the default is an upward trend. Short selling: the price falls below the lowest price of the last 20 K-lines, which is a downward trend by default.

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