ref: 301a23a2e82854c0c0fae2e60222ce70bc24d400 dir: /sys/src/cmd/diff/test/merge-t4.expected/
1 2 3 <<<<<<<<<< merge-t4.l 4 x 6 7 ========== original 4 5 6 7 ========== merge-t4.r w x y z >>>>>>>>>> 8 9 10