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var time = 0;
function setup() {
createCanvas(500, 500);
background(100);
}
function draw() {
background(0);
for (var i = 0; i <= 50; i = i+10)
{
ellipse(xPos(time+i), 200 + i, 50,50);
}
time++;
}
function xPos(time)
{
return 250 + sin(time/10)*100;
}