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examples:
koch snowflake
,
hilbert curve
,
spiral
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to square repeat 4 [fd 50 rt 90] end to triangle rt 30 repeat 3 [fd 50 rt 120] lt 30 end to house square fd 50 triangle bw 50 end to envelope square repeat 2 [fd 50 rt 90] triangle repeat 2 [fd 50 rt 90] end to st2 house lt 90 triangle lt 180 fd 50 rt 90 triangle bk 50 lt 90 triangle bk 50 lt 90 bk 50 end to st6 house repeat 3 [bk 50 square] lt 90 triangle rt 180 fd 50 lt 90 fd 50 rt 90 triangle bk 50 lt 90 bk 50 end to st1 repeat 6 [triangle rt 60] end cs st1
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