Foreign letters. Letters must be valid in the language being spoken. For example, “ж” is a letter in the Russian alphabet but is never used in English and so should never appear in any English source text.
Dunanw ka batakiw. Sɛbɛnw ka kan ka kɛ kan na min bɛ fɔ. Misali la, “ж” ye sɛbɛnni ye min bɛ Irisikan sɛbɛnnibolo la nka a tɛ baara kɛ ni a ye abada tubabukan na wa o la a man kan ka bɔ tubabukan bɔyɔrɔ sɛbɛn si kɔnɔ abada.