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examples:
koch snowflake
,
hilbert curve
,
spiral
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to tree :depth :length :scale :angle if :depth=0 [stop] setpensize round :depth/2 forward :length right :angle tree :depth-1 :length*:scale :scale :angle left 2*:angle tree :depth-1 :length*:scale :scale :angle right :angle back :length end clearscreen tree 10 50 0.7 45
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