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.
sitelen pi toki ante. o kepeken ala sitelen pi toki ante. o lukin: sitelen lili “ж” li tan toki Losi. taso, ona li lon ala toki pona. tan ni la, o kepeken ala ona.