Early Pre-Proto-Koigus-Badzni


 * i ɪ e ɛ → ɯ ʊ̜ ɤ ʌ/(K Q)_(K Q)
 * Ø → ə/ʔ_C
 * V → Ø/#_ʔ!_ʔ#
 * b gʷ → p b
 * ŋ ɴ → n
 * q ɢ χ ʁ → k g x ɣ
 * ɣ → w
 * ɟ → d
 * p b t d k g → ɸ β s z x ɣ/_C[+plosive]
 * oː → aː
 * Ø → i/{{ɾ l ɬ ɮ}_C, C_{ɾ l ɬ ɮ}}
 * {e(ː) ɪ(ː}} ɛː ɔː ʊ(ː)→ i(ː) eː oː u(ː)
 * e o→ i u/_C#
 * N → Ø/{ɪ ɛ ɔ ʊ}_C
 * eː → ia/stressed

Grammatical Number
There are two grammatical numbers in EPPKB which are "singulative" and "collective". All nouns are inherently collective and can be made singulative by attaching a suffix. There are a set of suffixes and which one a noun takes depends on which class it belongs to. There are 15 classes which are based on shape and form for inanimate nouns and types of beings for animate nouns.

Examples:


 * *keʔinu- ("sack.") > *keʔinudzàg- ("sack")
 * *tsmug- ("sand.") > *tsmūgüx- ("grain of sand")
 * *wokil- ("tail.") > *wokiliwük- ("tail")
 * *iz- ("stick.") > *izdzòkir- ("stick")
 * *lòu- ("leaf.") > lōwiʔiugiɬ- ("leaf")
 * *tiliziɮ- ("cud.") > *tiliziɮibàut- ("drop of cud")
 * *wonxm- ("mountain.") > *wonxmaɮir- ("mountain")
 * *maznil- ("water.") > *maznilinjō- ("drop of water")
 * *bjuzk- ("spear.") > *bjuzkud- ("spear")
 * *jaww- ("bowl.") > *jāwwan- ("bowl")
 * *pnō- ("son.") > *pnōèzg- ("son")
 * *bàs- ("fish.") > *bā̀sòʔiɮ- ("fish")
 * *dzō- ("wolf.") > *dzōdmi- ("wolf")
 * *pan- ("eagle.") > *pānits- ("eagle")
 * *dzjemz- ("god.") > *dzjemzbō- ("god")