anchor.diff:  antenna,antennas
   appendix,appendices
   athletics,athletics
  +attorney,attorneys
   axis,axes
   bacillus,bacilli
   baggage ,baggage 
  
positive.code: mathematics,mathematics
  means ,means 
  measles,measles
  memorandum,memoranda
  memo,memos
  man,men
  mouse,mice
  millennium,millennia
  moose,moose
  nucleus,nuclei
  oasis,oases
  
negative.code: chief,chiefs
  child,children
  clothing ,clothing 
  cod,cod
  corpus,corpora
  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
  