klingon_story1-8  Exercise 2: Why It Stayed in Beta
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Duolingo offered to promote the course, but its developers declined until the
software could handle Klingon properly. The problems were the case-sensitive
spelling (capital and small letters are different sounds) and the apostrophe,
which Duolingo's software treated as punctuation rather than a consonant.

It shows that Klingon's spelling does not behave like the spelling of a
natural language written in Latin letters, so ordinary software that assumes
case does not matter and apostrophes are not letters has to be adapted.