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examples:
koch snowflake
,
hilbert curve
,
spiral
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RESET PENUP FORWARD 100 PENDOWN REPEAT 4 [ FORWARD 30 RIGHT 90 FW 10 RT 90 FW 20 LT 90 FW 10 LT 90 FW 20 RT 90 ] HOME REPEAT 3 [ FORWARD 30 RIGHT 120 FW 10 RT 120 FW 20 LT 120 FW 10 LT 120 FW 20 RT 120 ]
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