diff --git a/.gitattributes b/.gitattributes
deleted file mode 100644
index 781a854..0000000
--- a/.gitattributes
+++ /dev/null
@@ -1 +0,0 @@
-*.pdf diff=pdfdiff
\ No newline at end of file
diff --git a/fundamentals-of-ai-and-kr/module1/main.pdf b/fundamentals-of-ai-and-kr/module1/main.pdf
index 72bdda5..e310e7e 100644
Binary files a/fundamentals-of-ai-and-kr/module1/main.pdf and b/fundamentals-of-ai-and-kr/module1/main.pdf differ
diff --git a/fundamentals-of-ai-and-kr/module2/main.pdf b/fundamentals-of-ai-and-kr/module2/main.pdf
new file mode 100644
index 0000000..b149798
Binary files /dev/null and b/fundamentals-of-ai-and-kr/module2/main.pdf differ
diff --git a/fundamentals-of-ai-and-kr/module3/main.pdf b/fundamentals-of-ai-and-kr/module3/main.pdf
index c03bfc2..9f349d5 100644
Binary files a/fundamentals-of-ai-and-kr/module3/main.pdf and b/fundamentals-of-ai-and-kr/module3/main.pdf differ
diff --git a/languages-and-algorithms-for-ai/module2/main.pdf b/languages-and-algorithms-for-ai/module2/main.pdf
index 9a9c7a5..3dcc6ec 100644
Binary files a/languages-and-algorithms-for-ai/module2/main.pdf and b/languages-and-algorithms-for-ai/module2/main.pdf differ
diff --git a/machine-learning-and-data-mining/main.pdf b/machine-learning-and-data-mining/main.pdf
index 9c9351b..13166a9 100644
Binary files a/machine-learning-and-data-mining/main.pdf and b/machine-learning-and-data-mining/main.pdf differ
diff --git a/statistical-and-mathematical-methods-for-ai/main.pdf b/statistical-and-mathematical-methods-for-ai/main.pdf
index 7d5dc2e..c137ef0 100644
Binary files a/statistical-and-mathematical-methods-for-ai/main.pdf and b/statistical-and-mathematical-methods-for-ai/main.pdf differ