First:<br>
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Second:<br>
<iframe width="560" height="315" src="http://www.youtube.com/embed/wTl8NiDBZbE" frameborder="0" allowfullscreen></iframe>

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Third:<br>
<iframe width="560" height="315" src="https://youtube.com/embed/wTl8NiDBZbE" frameborder="0" allowfullscreen></iframe>

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Fourth:<br>
<iframe width="560" height="315" src="http://youtube.com/embed/wTl8NiDBZbE" frameborder="0" allowfullscreen></iframe>