Pre-Proto-Koigus-Badzni


 * VFN → VːN
 * N1N2 → N1N1
 * j → w/C[+bilabial, +velar]
 * ɑ(ː) → ɔ(ː )→ o(ː) → u(ː)
 * X1{X2 w j} → {X2 u i}X1/where X2 is more sonorous than X1 (X=any phone) - starts from left to right