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examples:
koch snowflake
,
hilbert curve
,
spiral
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to tree :len :depth :amount forward :len/3 if :depth > 0 [ left 75 repeat :amount [ tree :len/2 :depth-1 :amount right 150/:amount ] tree :len/2 :depth-1 :amount left 75 ] back :len/3 end tree 350 4 5
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