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size(2000,600);
int x;
int y;
noStroke();
for(y=0; y < 600; y = y + 100)
{
for(x=0; x<2001; x = x + 100)
{
fill(random(10,255),(random(10,255)),(random(10,255)));
rect(x,y,100,100);
fill(255);
ellipse(x-50, y+50, random(1,100),random(1,100));
}
}