4

<iframe width="420" height="315" src="https://www.youtube.com/embed/dgxI3PT9IN8" frameborder="0" allowfullscreen></iframe>

2

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

1

<iframe width="420" height="315" src="https://www.youtube.com/embed/7Znh0OM9jiA" frameborder="0" allowfullscreen></iframe>