ch20
....\ch20_01
....\.......\bg.bmp
....\.......\ch20_01.cpp
....\.......\ch20_01.exe
....\.......\girl0.bmp
....\.......\girl1.bmp
....\.......\girl2.bmp
....\.......\girl3.bmp
....\.......\Thumbs.db
....\ch20_02
....\.......\bg.bmp
....\.......\bullet.bmp
....\.......\ch20_02.cpp
....\.......\ch20_02.exe
....\.......\ship.bmp
....\.......\Thumbs.db