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<!DOCTYPE html>
<html>
<script src="https://www.w3schools.com/lib/w3.js "></script>
<body>
<img class="mypic" src="something.jpg" width="100%">
<img class="mypic" src="something.jpg" width="100%">
<img class="mypic" src="something.jpg" width="100%">
<p>
<button onclick="myShow.previous()">Previous</button>
<button onclick="myShow.next()">Next</button>
</p>
<script>
myShow = w3.slideshow(".mypic", 0);
</script>
</body>
</html>
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