Q. [pw] became [pp]; [pw] > [pp]
The combination pw that arose from pm further developed into pp, much how this combination changed in Primitive Elvish. This is because after p, the m it did not fully develop to voiced w, passing instead through: pm > pƕ [pʍ] > pp. See the discussion on how [n], [m] became [t], [w] after voiceless stops and aspirates for further details.
Reference ✧ PE22/150
Order (01600)
| After | 01600 | AQ. [n], [m] became [t], [w] after voiceless stops and aspirates |
Related
Phonetic Rule Elements
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> |
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✧ PE19/85 (pƕ > pp) |
Phonetic Rule Examples
| napwa > nappa | pw > pp | √NAP > Q. nappa | ✧ VT47/20 |