whether the image is symmetrical knot? Imagine that you have to design a system of traffic lights regulating the passage of transport. In one series of all the traffic lights will be included on the green light, while all other row of lights to be included on red. Amateur magician uses knowledge of the theory of knots for an elegant "reading thoughts of the experiment." You ask to draw such a unit and to define its letters (no peeking), and then offer to go round an obstacle, calling the letter (which the magician writes the well-known scheme already). The two "entangled" the intersection any place. And the magician, "reading" of thought, calls encountered letters. It is easy to check, confusing letters caught twice in the same row.
Reed's General Engineering Knowledge For Engineers
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