It actually works with c, e, i, l, n, s, y and z keys too. The objective appears to be to give easy access to all language-specific accented characters from any keyboard where those character-variants are not on their selected keyboard's display. It certainly works well and is an 'in-line' way of providing easy-access to the facility without cluttering the display still further with more options that are seldom used by most people in most cases.