1Example from Hunt and McIlroy, “An Algorithm for Differential File Comparison.” 2https://www.cs.dartmouth.edu/~doug/diff.pdf 3 4-- old -- 5a 6b 7c 8d 9e 10f 11g 12-- new -- 13w 14a 15b 16x 17y 18z 19e 20-- diff -- 21diff old new 22--- old 23+++ new 24@@ -1,7 +1,7 @@ 25+w 26 a 27 b 28-c 29-d 30+x 31+y 32+z 33 e 34-f 35-g