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examples:
koch snowflake
,
hilbert curve
,
spiral
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reset left 90 forward 50 right 90 repeat 5 [forward 5 penup forward 5 pendown] right 90 repeat 5 [forward 5 penup forward 5 pendown] right 90 forward 50 forward 50 left 90 repeat 5 [forward 5 penup forward 5 pendown] left 90 repeat 5 [forward 5 penup forward 5 pendown] left 90 forward 50 left 90 penup forward 50 pendown right 90 repeat 5 [forward 5 penup forward 5 pendown] right 90 repeat 5 [forward 5 penup forward 5 pendown] right 90 penup forward 50 penup forward 50 pendown left 90 repeat 5 [forward 5 penup forward 5 pendown] left 90 repeat 5 [forward 5 penup forward 5 pendown] left 90 forward 50 right 180
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