1 --- test102.left-P.txt
2 +++ test102.right-P.txt
3 @@ -1,10 +1,9 @@
4 -A
5 -B
6  C
7 +B
8  A
9  B
10 -B
11  A
12 +C
13  X
14 -Y
15  Z
16 +Q