diff --git a/book-1/all.tex b/book-1/all.tex
index 73fa488..0970be0 100644
--- a/book-1/all.tex
+++ b/book-1/all.tex
@@ -8,3 +8,4 @@
 \input{book-1/6}
 \input{book-1/7}
 \input{book-1/8}
+\input{book-1/9}
\ No newline at end of file