anchor.diff:  uôi,uəj
   uý,wi
   uýu,wiu
  -uă,wă
  +uă,wă
   uơ,wɤ
   uạ,wa
   uại,waj
  -uạy,wăj
  +uạy,wăj
   uả,wa
   uải,waj
  -uảy,wăj
  +uảy,wăj
   uấ,wɤ̆
   uấy,wɤ̆j
   uầ,wɤ̆
  
positive.code: oò,ɔ
  oó,ɔ
  oõ,ɔ
  oă,wă
  oạ,wa
  oại,waj
  oạo,waw
  oạy,wăj
  oả,wa
  oải,waj
  oảo,waw
  oảy,wăj
  oắ,wă
  oằ,wă
  oẳ,wă
  oẵ,wă
  oặ,wă
  oẹ,wej
  oẹn,wen
  oẹo,wew
  
negative.code: ậ,ɤ̆
  ậu,ɤ̆w
  ậy,ɤ̆j
  ắ,ă
  ằ,ă
  ẳ,ă
  ẵ,ă
  ặ,ă
  ẹ,ɛ
  ẹo,ew
  ẻ,ɛ
  