anchor.diff:  oa,wa
   oai,waj
   oao,waw
  -oay,wăj
  +oay,wăj
   oe,wej
   oen,wen
   oeo,wew
  
positive.code: uôi,uəj
  uý,wi
  uýu,wiu
  uă,wă
  uơ,wɤ
  uạ,wa
  uại,waj
  uạy,wăj
  uả,wa
  uải,waj
  uảy,wăj
  uấ,wɤ̆
  uấy,wɤ̆j
  uầ,wɤ̆
  
negative.code: uyủ,wiu
  uà,wa
  uài,waj
  uày,wăj
  uá,wa
  uái,waj
  uáy,wăj
  uâ,wɤ̆
  uây,wɤ̆j
  uã,wa
  uãi,waj
  uãy,wăj
  uè,wɛ
  uèo,wew
  ué,wɛ
  