ᴱQ. initial [θʲ] became [hj], or [h] before [i]; [θj-|θji-] > [hj-|hi-]

Reference ✧ PE12/018.2301

Phonetic Rule Elements

[θj-] > [hj-] ✧ PE12/018.2302 (þ͡y > hy)
[θji-] > [hi-]