Posted on November 18, 2016 by yues0006 Uncategorized VIdeos https://blogs.ntu.edu.sg/da9004-201617s1-g15/files/2016/11/File_002-1yzm2s1.mp4 https://blogs.ntu.edu.sg/da9004-201617s1-g15/files/2016/11/File_004-zti8r8.mp4