Ex.9

https://software.thaiware.com/2764-HalfLife_%E0%B8%84%E0%B8%B3%E0%B8%99%E0%B8%A7%E0%B8%93%E0%B8%84%E0%B8%A3%E0%B8%B6%E0%B9%88%E0%B8%87%E0%B8%8A%E0%B8%B5%E0%B8%A7%E0%B8%B4%E0%B8%95_%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B8%98%E0%B8%B2%E0%B8%95%E0%B8%B8%E0%B8%81%E0%B8%B1%E0%B8%A1%E0%B8%A1%E0%B8%B1%E0%B8%99%E0%B8%95%E0%B8%A3%E0%B8%B1%E0%B8%87%E0%B8%AA%E0%B8%B5.html