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let px, py;
function setup() {
createCanvas(400, 400);
background(220);
px = -1;
py = -1;
}
function draw() {
// background(220);
}
function mousePressed() {
if (px == -1 || py == -1) {
px = mouseX;
py = mouseY;
} else {
line(px, py, mouseX, mouseY)
px = mouseX;
py = mouseY;
}
}