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function setup() {
createCanvas(400, 400);
background(220);
rectMode(CENTER);
a= 0
b = 100
c = 1;
}
function draw() {
translate(width / 2, height / 2);
rotate(a);
fill(c, 200, c)
rect(b, b, 52, 52);
a = a + 0.2
b = b - 0.2
c = c + .5
print(b)
if (b < -100) {
b = b * -1
}
}