Demo 4 chiếc
1.
(http://i.thefairest.info/fairest_thumbs/k3XVVS.jpeg)
2.
(http://i.thefairest.info/fairest_thumbs/wxKPYU.jpeg)
3.
(http://xkcd.com/pretty/800px-Forestfire4.jpg)
4.
(http://xkcd.com/pretty/cloud%5b1%5d.jpg)
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