But this is not the case, as we will now see. Languages like Kurdish admit of plausible reanalysis for a different reason. Some languages admit of reanalysis because of peculiar gaps that appear given published descriptions. These include Greleen Limburgian, Inuktitut, Irish, Khmer, Latvian, Meithei, Swabian, Vietnamese and White Hmong. Let us call the centralization of the second part of a diphthong a curtailed trajectory.
Curtailed trajectories are very common in languages with mirror-image diphthongs.
As we have seen, a number of languages seem to have mirror-image diphthongs. Many of these cases are better analyzed as containing GV or VG sequences with the glide in the onset or coda. But a number of other languages have mirror-image diphthongs that are harder to reanalyze. Many of these have a clear phonetic difference between diphthongs with relatively canonical members and mirror-image diphthongs with one centralized member, i.e. with curtailed trajectories. Future research will have to decide the issue.