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examples:
koch snowflake
,
hilbert curve
,
spiral
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to quarter :l :r fw 2 * :l circle :r rt arctan 2 fw (sqrt 5) * :l circle :r lt 2 * arctan 2 fw (sqrt 5) * :l circle :r lt 2 * arctan 1 / 2 fw (sqrt 5) * :l circle :r lt 2 * arctan 2 fw (sqrt 5) * :l rt arctan 2 fw 2 * :l lt 90 end reset circle 24 repeat 4 [quarter 48 24]
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