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