Reference for Niddah 57:6

לא שנו אלא שאין הראש עמהן אבל הראש עמהן הראש פוטר

differ on a principle of Samuel for Samuel has laid down: The head<span class="x" onmousemove="('comment',' Of a twin, if it was drawn back after it had been put out. ');">⁶</span>

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