# Example from Hunt and McIlroy, “An Algorithm for Differential File Comparison.”
# https://www.cs.dartmouth.edu/~doug/diff.pdf

-- old --
a
b
c
d
e
f
g
-- new --
w
a
b
x
y
z
e
-- diff --
diff old new
--- old
+++ new
@@ -1,7 +1,7 @@
+ w
  a
  b
- c
- d
+ x
+ y
+ z
  e
- f
- g