There are more phonemic tones than are marked in orthography, such as mid-high rising tone and mid tone being both unmarked ⟨a⟩ for example. Phonologically conditioned downstep is unmarked.
Tone Category
IPA
Orthography
Example
Gloss
high tone
˦
á, áá
tím
blood
mid tone
˧
a, aa
məb
louse
low tone
˨
à, àà
tɨ̀mnɨ
to drown
mid-high
˧˥
a, aá
tɨm
antelope
low-high*
˩˥
à
ɓùn
grass
high-low
˥˩
â, áà
bɨ̂ŋ
round, complete
high-mid
˥˧
â, áa
mîn
good
high-low-high
˥˩˦
âá
sîím
rainy season
*Only in eastern dialects, on short vowels. All other dialects merge this class with low tone.