diff --git a/.idea/dictionaries/root.xml b/.idea/dictionaries/root.xml
new file mode 100644
index 0000000..859fcaa
--- /dev/null
+++ b/.idea/dictionaries/root.xml
@@ -0,0 +1,3 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="root" />
+</component>
\ No newline at end of file
diff --git a/21_supplement.pdf b/21_supplement.pdf
index 5dc8d01..14df540 100644
Binary files a/21_supplement.pdf and b/21_supplement.pdf differ