This rule is a counterpart to the rule that voiceless stops were voiced before nasals. There are two examples of this rule: ᴹ✶kwentrō > Dor. cwindor (Ety/KWET) and ᴹ✶tankla > Ilk. tangol (Ety/TAK). There are no examples of this rule for [mp], but it may also have applied to this combination. Helge Fauskanger noted these developments in his analysis, and hypothesized that it might apply to Ilk. tingla- as well (AL-Doriathrin/cwindor; AL-Ilkorin/tangol, tingla-). It seems that this change did not occur finally or in later compounds: Ilk. rant or Ilk. Thorntor.