converts a following bu-letteral into a sumti representing the musical flat note with that name.
The next bu-letteral is absorbed and a flat accidental is given to it; e.g. "zi'e'o gy" means "the note G-flat". Use zi'e'u for double flats or subscript this cmavo to refer to a multiple of the flat, e.g. for triple flats or half flats. Subscripting with a negative value will refer to sharps instead. The first two syllables of the cmavo in the zi'e'a series were chosen for the similarity to "zgike". See also: zi'e'a, zi'e'e, zi'e'i and zi'e'u.