diff --git a/slides/lesson-10.pdf b/slides/lesson-10.pdf
new file mode 100644
index 0000000..6f52ef5
Binary files /dev/null and b/slides/lesson-10.pdf differ
diff --git a/slides/lesson-7.pdf b/slides/lesson-7.pdf
new file mode 100644
index 0000000..ab9af3f
Binary files /dev/null and b/slides/lesson-7.pdf differ
diff --git a/slides/lesson-8.pdf b/slides/lesson-8.pdf
new file mode 100644
index 0000000..fd8d081
Binary files /dev/null and b/slides/lesson-8.pdf differ
diff --git a/slides/lesson-9.pdf b/slides/lesson-9.pdf
new file mode 100644
index 0000000..f509f1a
Binary files /dev/null and b/slides/lesson-9.pdf differ