diff --git a/diff-1.6.0..1.9.0/src/doc/book/patterns.md b/diff-1.6.0..1.9.0/src/doc/book/patterns.md
deleted file mode 100644
index ab54f2a5..00000000
--- a/diff-1.6.0..1.9.0/src/doc/book/patterns.md
+++ /dev/null
@@ -1,13 +0,0 @@
---- a/src/doc/book/patterns.md
-+++ b/src/doc/book/patterns.md
- 
-@@ -324,7 +358,7 @@ match x {
- ```
- 
- This prints `no`, because the `if` applies to the whole of `4 | 5`, and not to
--just the `5`. In other words, the precedence of `if` behaves like this:
-+only the `5`. In other words, the precedence of `if` behaves like this:
- 
- ```text
- (4 | 5) if y => ...
-diff --git a/src/doc/book/primitive-types.md b/src/doc/book/primitive-types.md