James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 218.
IPAspelling:
wi
Frances Karttunen:
HU(I) suppletive verb with YĀ to go / ir (K) In view of HUĪLOHUA, and possibly of HUĪCA, HUĪTZ, and HUĪCATZ, a case might be made for basic HUĪ, but the I is short in the imperfect and optative, and it /K87/ disappears in the construction YĀ-HU(I) > YAUH. Only short vowels are susceptible to such deletion, but there is clearly irregularity in the whole suppletive relationship of YĀ and HU(I). See YĀ. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 88.