STRATIFICATION

aa ai an ar as at fa if in is it na no of oi on or os si so ta ti to

aas act aft ain air ais ait ana ani ant arc arf ars art att can car cat cis con cor cos cot fan far fas fat fin fir fit fon for fro ifs ins ion its nit nor nos not oaf oar oat oca oft ons ora orc ors ort rai ran ras rat ria rif rin roc rot sac sat sic sin sir sit son sot sri tan tao tar tas tat tic tin tis tit ton tor tot

acta acts afar ains airn airs airt aits anas anis anoa ansa anta anti ants arco arcs arfs aria arts asci cain cans cant carn cars cart casa cast cats ciao cion cist coat coft coif coin coir coni cons corf corn cors cost cots cris crit fact fain fair fano fans faro fart fast fats fiar fiat fico fino fins firn firs fisc fist fits foci foin fons font fora fort frat frit icon info inia inro inti into ions iota iris iron naif naoi naos narc nisi nits noir nori nota oafs oars oast oats ocas orca orcs orts osar otic raft raia rain rais rani rant rato rats rias rifs rift rins riot roan rocs rota roti rots sain sari sati scan scar scat scot sift snit snot soar soca sofa soft sora sori sorn sort star stat stir stoa stot taco tact tain tans taos tarn taro tars tart tats tics tins tint tiro titi tits toft toit tons tora torc tori torn tors tort tost tots trio trot tsar