COMBUSTORS

bo mo mu om or os so to um us ut

boo bos bot bro bum bur bus but cob coo cor cos cot cru cub cum cur cut mob moc moo mor mos mot mus mut oms oot orb orc ors ort our out rob roc rom rot rub rum rut sob som sos sot sou sub sum tom too tor tub urb uts

boom boor boos boot bort boss bots bout broo bros brut bums burs buss bust buts cobs comb coos coot corm cors coss cost cots crus cubs curb curs curt cuss cuts mobs mocs moor moos moot mors mort moss most mots muss must muts oots orbs orcs orts ours oust outs robs rocs roms room root roto rots rout rubs rums rust ruts scot scum scut smut sobs soms soot sorb sort sots sour sous stob stub stum subs sumo sums tomb toms toom torc toro tors toss tour tubs umbo urbs