anchor.diff:  æ,{,mid-open front unrounded vowel
   ɐ,6,open-mid schwa
   a,a,open front unrounded
  +ă,a_X,extra short open front unrounded
   ɶ,&,front open rounded
   ɑ,A,open back unrounded
   ɒ,Q,open back rounded
  
positive.code: ʑ,z\,vl alveolopalatal fricative
  ʘ,O\,bilabial click
  ǀ,|\,dental click
  !,!\,click
  ǂ,'=\,alveolar click
  ǁ,|\|\,alveolar lateral click
  ɺ,l\,vl alveolar lateral flap
  
negative.code: ː,:,length mark
  ˑ,:\,half-length
  ̆,_X,extra-short
  .,.,syllable break
  ʍ,W,vl labial-velar fricative
  w,w,vd labio-velar approximant
  ɥ,H,labial-palatal approximant
  