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function setup() {
createCanvas(600, 600);
background(0);
stroke(255);
strokeWeight(6);
gris = 255;
x = 0;
interval = 6;
}
function draw() {
background(0);
// gris = gris - 4;
stroke(gris,0,gris);
line(x,0,x,height);
x = x + interval;
if(x == width) {
x = 0;
gris = 255;
background(0);
}
}