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According to the Ptil Tekhelet organization, the approach of the Vilna Gaon is: This method defines a chulyah as a group of three twists. It has 13 chulyot, and alternates white and Tekhelet between them, starting and ending with a chulyah of white. Those chulyot are distributed between five (double) knots with four chulyot between the top four knots and ...

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