Quy tắc nhóm sóng đối xứng: Week: (A) (B) (C)... Daily: I, II, III... H4: (1) (2) (3)... H1: 1, 2, 3... Sóng hồi lớn nhất có quy luật 80/20 thì nhóm chung số sóng.
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