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examples:
koch snowflake
,
hilbert curve
,
spiral
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to st4 st1 right 90 fd 50 right 150 triangle left 30 fd 50 right 60 fd 50 right 90 triangle left 30 fd 50 right 60 fd 50 right 90 triangle end to st3 st1 right 90 fd 50 right 30 square left 150 square repeat 4 [fd 50 left 60 square] end to st1 repeat 6 [triangle right 60] end to st6 repeat 4 [square fd 50] right 90 fd 50 left 90 triangle right 180 fd 200 left 90 triangle right 180 fd 50 right 90 fd 50 left 90 triangle end to st2 square fd 50 right 90 fd 50 left 90 triangle right 210 triangle left 30 fd 50 right 90 fd 50 left 90 right 210 triangle right 150 triangle right 180 end to envelope square fd 50 right 180 triangle fd 50 right 180 end to square repeat 4 [fd 50 right 90] end to triangle lt 90 repeat 3 [fd 50 right 120] right 90 end to house square fd 50 right 90 fd 50 lt 90 triangle left 90 fd 50 left 90 fd 50 right 180 end clear st4
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