let yy = 0
let xx = 0
basic.showIcon(IconNames.Happy)
basic.pause(2000)
basic.clearScreen()
basic.forever(function () {
    xx = 0
    for (let index = 0; index < 5; index++) {
        yy = 0
        for (let index = 0; index < 5; index++) {
            led.plot(xx, yy)
            basic.pause(200)
            yy += 1
        }
        xx += 1
    }
    basic.pause(1000)
    basic.clearScreen()
})