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examples:
koch snowflake
,
hilbert curve
,
spiral
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CS ST PD REPEAT 19 [FD 5 RT 10] SETH 0 REPEAT 19 [FD 5 RT 10] SETH 270 REPEAT 3 [FD 114 LT 120] FD 55 RT 90 PU FD 23 LT 90 PD REPEAT 36 [FD 5 RT 10] RT 90 PU FD 57 LT 90 PD REPEAT 36 [FD 2 RT 10]
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