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examples:
koch snowflake
,
hilbert curve
,
spiral
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to pasek :length :order if :order <= 1 [ forward :length stop ] pasek :length / 3 :order - 1 lt 60 pasek :length / 3 :order - 1 rt 120 pasek :length / 3 :order - 1 lt 60 pasek :length / 3 :order - 1 end to platek :length :order penup fd :length*0.66 rt 150 pendown repeat 3 [ pasek :length :order rt 120 ] end clearscreen pasek 200 3
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