function bubbleHover() {
for (var e = document.querySelectorAll('circle'), t = 0; t < e.length; t++) {
e[t].addEventListener('mouseover', function () {
fillColor(this)
})
}
}
function fillColor(e) {
e.setAttribute('style', 'fill:' + colors[Math.floor(Math.random() * colors.length)])
}
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