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examples:
koch snowflake
,
hilbert curve
,
spiral
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to l :l :w if :l = 0 [stop] rt 90 r :l -1 :w fw :w lt 90 l :l -1 :w fw :w l :l-1 :w lt 90 fw :w r :l -1 :w rt 90 end to r :l :w if :l = 0 [stop] lt 90 l :l -1 :w fw :w rt 90 r :l -1 :w fw :w r :l -1 :w right 90 fw :w l :l -1 :w lt 90 end reset setxy 60 440 penwidth 4 l 6 6
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