Response to previous post: No formal 'you'

No formal ‘you’ after all:  Since Villalteco Zapotec has a formal ‘you’ (the usted in Spanish), I suspected that Isthmus Zapotec did, as well.  It does not.  I just read in Gramática Popular del Zapoteco del Istmo (Pickett & Black, 2001), “No hay diferencia entre usted y tú” (p. 28, http://www-01.sil.org/mexico/zapoteca/istmo/G023b-GramaticaZapIstmo-zai.pdf). The singular 'you' in IZ is lii.