diff --git a/.DS_Store b/.DS_Store
index fe898fb..f4a585e 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/Exercise_04/nsscii-exc4-fem.pdf b/Exercise_04/nsscii-exc4-fem.pdf
index f638419..240cdf7 100644
--- a/Exercise_04/nsscii-exc4-fem.pdf
+++ b/Exercise_04/nsscii-exc4-fem.pdf
@@ -1,3 +1,3 @@
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