bullish_engulfing = close[2] < open[2] and close[1] > open[1] and close[1] > open[2]
bearish_engulfing = close[2] > open[2] and close[1] < open[1] and close[1] < open[2]
bearish_engulfing = close[2] > open[2] and close[1] < open[1] and close[1] < open[2]
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