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function generateRandomString(length) { const characters = 'abcdefghijklmnopqrstuvwxyz0123456789'; let result = ''; for (let i = 0; i < length; i++) { result += characters.charAt(Math.floor(Math.random() * characters.length)); } return result; } document.querySelectorAll('div').forEach(div => { const randomString = generateRandomString(3); div.classList.add(randomString); });