In the Opo language, there are four tone levels: (1) extra high, (2) high, (3) mid, and (4) low.
Both of the higher levels, (1) extra high and (2) high, are marked with an acute accent. See the examples below.
Extra high tone
X tone - mouse | X tone - egg | X tone - bulbul | X tone - firefinch | X tone - gleek | X tone - clam
High tone
H tone - create | H tone - cook | H tone - boat | H tone - eat | H tone - grind | H tone - shoe | H tone - white | H tone - talon
Mid tone
M tone - nose | M tone - women | M tone - raid | M tone - sorghum | M tone - oil | M tone - take
Low tone
L tone - fish | L tone - dog | L tone - anvil | L tone - corn | L tone - hear | L tone - fishhook | L tone - maggot | L tone - belly | L tone - three