anchor.diff:  antenna,antennas
   appendix,appendices
   athletics,athletics
  +attorney,attorneys
   axis,axes
   bacillus,bacilli
   baggage ,baggage 
  
positive.code: furniture ,furniture 
  gallows,gallows
  goose,geese
  genus,genera
  grouse,grouse
  hair,hair
  half,halves
  headquarters,headquarters
  hippopotamus,hippopotami
  hoof,hooves
  
negative.code: stadiums,stadiums
  stereo,stereos
  stimulus,stimuli
  stratum,strata
  succubus,succubi
  swine,swine
  syllabus,syllabi
  