Yes. It's one of the problems of Duolingo. It accepts one letter difference as typos even though one letter can make a huge difference in Klingon. Though I've had some recent contact with staff that makes me think we might be able to ask for particular exceptions. However, the problem is that I think we have to ask for whole word exceptions. I'm going to see if I can get an exception entered for bIleghlaH not to be accepted as a typo for DIleghlaH, but that still won't help with the many other one letter different conflicts and it's going to be a lot of work to try to enter them all.