ᴱQ. voiceless stops plus [xʷ] became [kʷ]; [{tʲptk}xʷ] > [kʷ]

Reference ✧ PE12/017.3201-2

Phonetic Rule Elements

[{tʲptk}xʷ] > [kʷ] ✧ PE12/017.3307 (voiceless stops + x͡w > q)