diff --git a/img/16_1.png b/img/16_1.png new file mode 100644 index 00000000..13803b14 Binary files /dev/null and b/img/16_1.png differ diff --git a/img/16_2.png b/img/16_2.png new file mode 100644 index 00000000..cbb86af2 Binary files /dev/null and b/img/16_2.png differ diff --git a/img/16_3.png b/img/16_3.png new file mode 100644 index 00000000..fc310205 Binary files /dev/null and b/img/16_3.png differ diff --git a/img/16_4.png b/img/16_4.png new file mode 100644 index 00000000..ea2d80b4 Binary files /dev/null and b/img/16_4.png differ