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var x = 0;
var y = 0;
function setup() {
createCanvas(400, 400);
background(255);
}
function draw() {
if (random(1) > 0.5) {
rect(x, y, x+50, y+50);
fill(random(255),0,0);
}
else {
rect(x, y+50, x+50, y);
}
x += 50;
if (x > width) {
x = 0;
y += 50;
}
if (y > height) {
background(255);
x = 0;
y = 0;
}
}