On grammatical class:

by
letteral for b.
cy
letteral for c.
dy
letteral for d.
fy
letteral for f.
gy
letteral for g.
jy
letteral for j.
ky
letteral for k.
ly
letteral for l.
my
letteral for m.
ny
letteral for n.
py
letteral for p.
ry
letteral for r.
sy
letteral for s.
ty
letteral for t.
vy
letteral for v.
xy
letteral for x.
y'y
letteral for '.
zy
letteral for z.
ai'y
letteral for i when ending a diphthong (ai, ei, oi), sometimes written as ị
au'y
letteral for u when ending a diphthong (au), sometimes written as ụ
a'y
letteral for a.