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When we’ve both completed a couple strips, she shows me how to tie them together with a square knot.

If the knot tends to lie vertically along the shoe, it's a weaker granny knot, whereas if the knot is horizontal, it's the stronger square knot.

Essentially, tying the frog involves tying bunches of deer hair to a hook with three lengths of plain white sewing thread, using a series of overhand knots and square knots.

Could you tie a series of square knots around the neck of a teaspoon without, even slightly, moving the teaspoon?

Liston closed off the main artery with a square knot and then turned his attention to the smaller blood vessels, which he drew up one by one using a sharp hook called a tenaculum.