SUBSTRACTOR

ab ar as at ba bo or os so ta to us ut

abo abs act arb arc ars art ass att bar bas bat boa bos bot bra bro brr bur bus but cab car cat cob cor cos cot cru cub cur cut oar oat oba oca ora orb orc ors ort our out ras rat rob roc rot rub rut sab sac sat sau sob sos sot sou sub tab tao tar tas tat tau tor tot tub tut urb uta uts

abos abut acts arbs arco arcs arts auto bars bass bast bats batt boar boas boat bora bort boss bota bots bott bout bras brat bros brut bura burr burs buss bust buts butt cabs carb carr cars cart cast cats coat cobs cors coss cost cots crab crus cubs curb curr curs curt cuss cuts oars oast oats obas ocas orbs orca orcs orra orts osar ossa ours oust outs rato rats roar robs rocs rota rots rout rubs rust ruts sabs sacs scab scar scat scot scut soar soba sobs soca sora sorb sort sots sour sous stab star stat stoa stob stot stub suba subs sura tabs tabu taco tact taos taro tars tart tass tats taus taut tora torc torr tors tort toss tost tots tour tout trot tsar tuba tubs tuts urbs ursa utas