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Recently I am studying the basic knowledge of screen formula. And I found that it is easy to write formula to search some bullish or bearish candlestick such as engulfing and hammer. But it is really hard to search some price patterns such as double top or double bottom. So I checked the predefined screen formula. Such as PnF Double Bottom Breakout. But the screen result seems to be not so much like the price pattern that I used read from books. I guess maybe I can modify the parameter of this formula. But is it possible that I can check the details of these predefined formula? Thank you