Running LED on 5x5 microbit

let index = 0
index = 0
basic.forever(() => {
    for (let index2 = 0; index2 <= 4; index2++) {
        led.plot(index2, 0)
        basic.pause(100)
    }
    for (let index3 = 0; index3 <= 4; index3++) {
        led.unplot(index3, 0)
        basic.pause(100)
    }
    for (let index4 = 0; index4 <= 4; index4++) {
        led.plot(4, index4)
        basic.pause(100)
    }
    for (let index5 = 0; index5 <= 4; index5++) {
        led.unplot(4, index5)
        basic.pause(100)
    }
    for (let index6 = 4; index6 >= 0; index6--) {
        led.plot(index6,4 )
        basic.pause(100)
    }
for (let index62 = 4; index62 >= 0; index62--) {
        led.unplot(index62,4 )
        basic.pause(100)
    }
for (let index63 = 4; index63 >= 0; index63--) {
        led.plot(0, index63)
        basic.pause(100)
    }
for (let index622 = 4; index622 >= 0; index622--) {
        led.unplot(0,index622)
        basic.pause(100)
    }
})