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%!CairoScript
/hA { % cr dist lvl *hA* cr dist
dup not { pop } {
1 sub
3 copy hB 0 exch L pop
3 copy hA 0 L pop
3 copy hA neg 0 exch L pop
hC
} ifelse
} bind def
/hB { % cr dist lvl *hB* cr dist
dup not { pop } {
1 sub
3 copy hA 0 L pop
3 copy hB 0 exch L pop
3 copy hB neg 0 L pop
hD
} ifelse
} bind def
/hC { % cr dist lvl *hC* cr dist
dup not { pop } {
1 sub
3 copy hD neg 0 L pop
3 copy hC neg 0 exch L pop
3 copy hC 0 L pop
hA
} ifelse
} bind def
/hD { % cr dist lvl *hD* cr dist
dup not { pop } {
1 sub
3 copy hC neg 0 exch L pop
3 copy hD neg 0 L pop
3 copy hD 0 exch L pop
hB
} ifelse
} bind def
dict
/width 1024 set
/height 1024 set
surface context
2 2 m 4 10 hA pop 1 g set-source stroke
/target get (out.png) write-to-png pop
pop
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