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===Example 4: Koch curve=== A variant of the [[Koch snowflake|Koch curve]] which uses only right angles. : '''variables''' : F : '''constants''' : + − : '''start''' : F : '''rules''' : (F β F+F−F−F+F) Here, F means "draw forward", + means "turn left 90Β°", and − means "turn right 90Β°" (see [[turtle graphics]]). : ''n'' = 0: :: F :: [[File:square koch.svg|Koch Square - 0 iterations]] : ''n'' = 1: :: F+F−F−F+F :: [[File:square koch 1.svg|Koch Square - 1 iterations]] : ''n'' = 2: :: F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F :: [[File:square koch 2.svg|Koch Square - 2 iterations]] : ''n'' = 3: :: F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F+ ::F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F− :: F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F− :: F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F+ :: F+F−F−F+F+F+F−F−F+F−F+F−F−F+F−F+F−F−F+F+F+F−F−F+F :: [[File:square koch 3.svg|Koch Square - 3 iterations]]
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