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void setup() {
size(500, 500);
}
void draw() {
background(0);
translate(width / 2, height / 2);
for (int i = 0; i < 200; i += 1) {
translate(20, i);
float a = map(sin(millis() / 10000.0), -1, 1, 0, 2 * PI);
ellipse(0, 0, 10, 10);
rotate(a);
}
}