This is the collation rules sequence, produced by a little app I wrote from the input string:

("< ʔ < a < ạ,ạ < c " + 
 " < c̣ < cʼ < ə < ə̣ " + 
 " < h < ḥ,ḥ < ḥʷ,ḥʷ < i " + 
 " < ị,ị < k < kʼ < kʷ " + 
 " < kʼʷ < l < ḷ,ḷ < lˀ " + 
 " < ḷˀ,ḷˀ < ɬ < ƛʼ < m " + 
 " < mˀ < n < nˀ < p " + 
 " < pʼ < q < qʼ < qʷ " + 
 " < qʼʷ < r < rˀ < s " + 
 " < ṣ,ṣ < t < tʼ < u " + 
 " < ụ,ụ < w < wˀ < x " + 
 " < xʷ < x̣ < x̣ʷ < y " + 
 " < yˀ < ʕ < ʕˀ < ʕʷ < ʕˀʷ ")