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examples:
koch snowflake
,
hilbert curve
,
spiral
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to quarter :l :r fw 4 * :l circle :r bw :l lt 90 fw 2 * :l circle :r bw 4 * :l circle :r fw 2 * :l lt 90 fw 3 * :l lt 90 end reset ct circle 144 repeat 4 [quarter 48 48 * ((sqrt 13) - 3)]
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