diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 6040da5..0000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/ch03/.DS_Store b/ch03/.DS_Store
index 1892cae..99de1d0 100644
Binary files a/ch03/.DS_Store and b/ch03/.DS_Store differ