When I compare two files with just numbers, in addition to < and > signs, I also have | signs at some of the lines. For example,
25746 | 26123
I checked the manual and it says
The corresponding lines differ, and they are either both complete or both incomplete.
This statement is not fully clear to me. I checked such lines and couldn't spot a difference than the others. How can I fix these lines to lines with < and >?