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<head>
<style type="text/css">
.A0{
background-position: 100px 100px;
}
.A1{
background-position: 200px 200px;
}
</style>
</head>
<body>
<h1>Problem 1</h1>
<img class="A0" src="squares.png" />
<head>
<style type="text/css">
.A0,.A1{background:url(squares.png)}
.A0{
background-position: 100px 100px;
}
.A1{
background-position: 200px 200px;
}
</style>
</head>
<body>
<h1>Problem 1</h1>
<div class="A0"></div>
<div class="A1"></div>