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size (600,600);
background(0);
for(int y=-10; y<700; y=y+35){
smooth (10);
for(int x=-10; x<700; x=x+35){
fill(y,y+10,100,0);
strokeWeight ((y+11)/40);
stroke (y/2,y/2,y*600,20);
ellipse(x,y,250,250);
strokeWeight ((700-y)/20);
ellipse(x,y,250,250);
}
}