diff --git a/docs/courses/comp-206.org.gpg b/docs/courses/comp-206.org.gpg
index c607df8..ee3bc5e 100644
Binary files a/docs/courses/comp-206.org.gpg and b/docs/courses/comp-206.org.gpg differ
diff --git a/docs/images/comp-206-an-object-has-an-interface-relationships.png b/docs/images/comp-206-an-object-has-an-interface-relationships.png
index 67b380d..a16015d 100644
Binary files a/docs/images/comp-206-an-object-has-an-interface-relationships.png and b/docs/images/comp-206-an-object-has-an-interface-relationships.png differ
diff --git a/docs/images/comp-206-inheritance-reusing-the-implementation-1.png b/docs/images/comp-206-inheritance-reusing-the-implementation-1.png
index 79f11f1..6de7900 100644
Binary files a/docs/images/comp-206-inheritance-reusing-the-implementation-1.png and b/docs/images/comp-206-inheritance-reusing-the-implementation-1.png differ
diff --git a/docs/images/comp-206-inheritance-reusing-the-implementation-2.png b/docs/images/comp-206-inheritance-reusing-the-implementation-2.png
index 360720a..b52acd3 100644
Binary files a/docs/images/comp-206-inheritance-reusing-the-implementation-2.png and b/docs/images/comp-206-inheritance-reusing-the-implementation-2.png differ
diff --git a/docs/images/comp-206-inheritance-reusing-the-implementation-3.png b/docs/images/comp-206-inheritance-reusing-the-implementation-3.png
index a690455..a508461 100644
Binary files a/docs/images/comp-206-inheritance-reusing-the-implementation-3.png and b/docs/images/comp-206-inheritance-reusing-the-implementation-3.png differ
diff --git a/docs/images/comp-206-inheritance-reusing-the-implementation-4.png b/docs/images/comp-206-inheritance-reusing-the-implementation-4.png
index 4bca771..b813549 100644
Binary files a/docs/images/comp-206-inheritance-reusing-the-implementation-4.png and b/docs/images/comp-206-inheritance-reusing-the-implementation-4.png differ
diff --git a/docs/images/comp-206-inheritance-reusing-the-implementation-5.png b/docs/images/comp-206-inheritance-reusing-the-implementation-5.png
index 58d576b..430693a 100644
Binary files a/docs/images/comp-206-inheritance-reusing-the-implementation-5.png and b/docs/images/comp-206-inheritance-reusing-the-implementation-5.png differ
diff --git a/docs/images/comp-206-the-hidden-implementation.png b/docs/images/comp-206-the-hidden-implementation.png
index ca59778..db51315 100644
Binary files a/docs/images/comp-206-the-hidden-implementation.png and b/docs/images/comp-206-the-hidden-implementation.png differ