ah , a [ah! oh!] an interjection.
atat attat , attatae , attattatae, etc. [oh! ah! alas!] an interjection.
au [oh!] an interjection.
ehem [oho! well well!].
hau [oh!] an interjection.
heu [oh! alas!] an interjection.
oh [oh! , ah!] an interjection.
oi [oh! ah!] an interjection.
utinam [would that! oh that!].
vah (vaha archaic) [oh! ah!] an interjection.