Nison, in his book (http://www.amazon.com/Japanese-Candlestick-Charting-Techniques-Second/dp/0735201811 ), declares the harami (or harami cross) must be preceded by an unusually long real body. Moreover, I prefer to watch for plays with dojis as a long-legged doji or dragonfly doji. These combinations make this formation particularly intriguing.
I have additional ideas about how to play these, but I'll elaborate later after I confirm these are accurate.
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