The voiceless labial stop survived initially from Primitive Elvish into Ilkorin (PE19/18), but it became [b] after vowels (PE19/23) and became [f] after liquids and voiceless stops. It was preserved medially in a few clusters, notably [sp].
References ✧ PE19/18, 21
|Ilk. [no change]||
||✧ PE19/18 (p- > p-); PE19/21 (pr- > pr-); PE19/21 (pl- > pl-)|