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L-system explorer

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L-system explorer. Use the mouse to move and zoom. Press the "less than" and "greater than" keys to select from 15 different L-systems. Press "n" for the next iteration. Press "p" for the previous iteration. Press "i" to toggle the cycling of the iterations. Press "q", "w", "a", "e" to toggle the progressive coloring options. Press "+" to increase the stroke weight. Press "-" to decrease the stroke weight. Press "r" to toggle the show rendering. Press "g" to toggle graph paper. Press "k" and "l" to increase and decrease the frame rate. Press "t" to toggle a turtle pen.
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