How do I make a twisted cord in knitting?

How do umbilical cords get twisted?

A baby situated in a foot-first breech position can compromise the umbilical cord by twisting it unnaturally. A potentially life-threatening condition called vasa previa occurs when one or more blood vessels in the umbilical cord cross the entrance to the birth canal beneath the baby.

What is cord yarn?

In textile: Cord yarns. Cord yarns are produced by twisting ply yarns together, with the final twist usually applied in the opposite direction of the ply twist.

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