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<p>which can be used to model <a href="page.php?w=plant_development">plant growth patterns</a> in the style of <a href="page.php?w=fractal">fractal</a>s. L-systems have an <a href="page.php?w=alphabet">alphabet</a> of symbols that can be combined using <a href="page.php?w=Formal_grammar">production rules</a> to build larger strings of symbols, and a mechanism for translating the generated strings into geometric structures. In 1975, after centuries of slow development of the mathematics of patterns by <a href="page.php?w=Gottfried_Leibniz">Gottfried Leibniz</a>,</p><p>
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