In printed texts, some letter pairs have more space between them than others because of their shape and slate. Pair kerning automatically reduces the space between such letter pairs to enhance their appearance. Otherwise, they would be spaced too close or too far apart to be aesthetically pleasing.
While the first ôWAö and ôLTö are non-kerned letter pairs, the second ôWAö and ôLTö are clearly kerned.