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A granny square worked in two colors and seven rounds. Cotton, four-millimetre (0.16 in) crochet hook. A granny square is a piece of square fabric produced in crochet by working in rounds from the center outward. Granny squares are traditionally handmade as crochet and cannot be manufactured by machine. They resemble coarse lace.
Thus a single line can be drawn connecting all nine dots—which would appear as three lines in parallel on the paper, when flattened out. [18] It is also possible to fold the paper flat, or to cut the paper into pieces and rearrange it, in such a way that the nine dots lie on a single line in the plane (see fold-and-cut theorem). [17]
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It is closely related to the square knot, which can also be described as a connected sum of two trefoils. Because the trefoil knot is the simplest nontrivial knot, the granny knot and the square knot are the simplest of all composite knots. The granny knot is the mathematical version of the common granny knot.
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Some of the squares formed by the dots have numbers inside them. The objective is to connect horizontally and vertically adjacent dots so that the lines form a simple loop with no loose ends. In addition, the number inside a square represents how many of its four sides are segments in the loop.
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