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The Crab is a precise Harmonic pattern that I discovered in 2000. The Crab is a distinct 5-point extension structure that utilizes a 1.618 projection of the XA leg exclusively. This is the most critical aspect of the pattern and the defining level in the Potential Reversal Zone (PRZ). The extreme (2.618, 3.14, 3.618) projection of the BC compliments the 1.618 XA extension.