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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<title>Counter</title>
</head>
<body>
<script>
let sum = (a, b) => a + b;
document.write(sum(8, 2))
let mul = function(a, b) {
return a * b;
};
document.write(mul(3, 5));
</script>
</body>
</html>