anchor.diff:  chief,chiefs
   child,children
   clothing ,clothing 
  +cod,cod
   corpus,corpora
  -crisis,crises
  +corps,corps
   crisis,crises
   criterion,criteria
   cuff,cuffs
  +cul-de-sac,culs-de-sac
   curriculum,curricula
   datum,data
   deer,deer
   diagnosis,diagnoses
  +die,dice
   dozen,dozen
   dwarf,dwarves
   economics,economics
  
positive.code: stadiums,stadiums
  stereo,stereos
  stimulus,stimuli
  succubus,succubi
  swine,swine
  syllabus,syllabi
  
negative.code: kidney,kidneys
  knife,knives
  leaf,leaves
  louse,lice
  linguistics,linguistics
  life,lives
  loaf,loaves
  