Sorry, but I don't follow what you're disagreeing with. For the numeric stems there are two systems, and one learns which to use when, as I said. For the sound

Sorry, but I don't follow what you're disagreeing with. For the numeric stems there are two systems, and one learns which to use when, as I said. For the sound change, I didn't say it was "regular" (and I don't know what you mean by that here), I said that it's not specific to counters. wiki: https://ja.wikipedia.org/wiki/%E9%80%A3%E6%BF%81 https://ja.wikipedia.org/wiki/%E9%80%A3%E6%BF%81 As for whether it's unique, wiki suggests that Korean has something similar but I wouldn't know.