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/rot { 3 -1 roll } def
/2dup { 2 copy } def
/circle { % context radius -- context
2dup 0 m pop
0 0 rot 0 math.2pi arc h
} def
/circles { % context #circles -- context
1 1 rot { circle } for
} def
/SIDE 600. def
/SIZE 600. def
<< /width SIZE /height SIZE >> surface context
1 1 1 set-source-rgb paint
0 0 0 set-source-rgb
//EVEN_ODD set-fill-rule
/r 4 def
/n SIDE 1.5 mul r div integer def
SIZE SIDE div dup scale
save
302 200 translate
r dup scale
n circles
restore
save
100 300 translate
r dup scale
n circles
restore
save
500 400 translate
r dup scale
n circles
restore
fill
/target get (out.png) write-to-png pop
pop
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