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let x = 0;
let y = 0;
let spacing = 20;
function setup() {
createCanvas(400, 400);
background(0);
}
function draw() {
stroke(255);
if (random(1) < 0.5) {
line(x, y, x + spacing, y + spacing);
} else {
line(x, y + spacing, x + spacing, y);
}
x = x + spacing;
if (x > width) {
x = 0;
y = y + spacing;
}
}