diff --git a/05.Basic_Concepts_IV.pdf b/05.Basic_Concepts_IV.pdf index ed403b4..ee08845 100644 Binary files a/05.Basic_Concepts_IV.pdf and b/05.Basic_Concepts_IV.pdf differ diff --git a/06.Object_Oriented_I.pdf b/06.Object_Oriented_I.pdf index a973ff5..c7c2e7f 100644 Binary files a/06.Object_Oriented_I.pdf and b/06.Object_Oriented_I.pdf differ