N. voiced spirants unvoiced before voiceless spirants; [{vð}{hx}] > [{fθ}]

N. voiced spirants unvoiced before voiceless spirants; [{vð}{hx}] > [{fθ}]
See S. voiced spirants unvoiced before voiceless spirants for discussion.

Phonetic Rule Elements

[vh] > [f]
[ðh] > [θ]

Phonetic Rule Examples

jovhug > jofug vh > f ON. yōbasūka > iovhug > N. iofog ✧ TMME/53