Q. [ɸu] became [hu]; [ɸu] > [hu]

Reference ✧ PE19/71 ✧ for example: huine < ✶phuinē

Related

Phonetic Rule Elements

[ɸu] > [hu] ✧ PE19/071.0510 ([ᵽ] > [h]; before [ū̆/ui])