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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <link href="aaa.css" rel="stylesheet">

</head>

<body>
    <section></section>
    <section></section>
</body>


</html>

section {
    width: 600px;
    height: 200px;
}

section:nth-of-type(1){
    background-color: red;
}

section:nth-of-type(2){
    background-color: blue;

}

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