ROBUSTIOUSLY

bi bo by is it li lo oi or os oy si so ti to us ut yo

bio bis bit boo bos bot boy bro bur bus but buy bys its lib lis lit lob loo lot obi oil oot orb ors ort our out rib rob rot rub rut sib sir sis sit sly sob sol sos sot sou soy sri sty sub til tis too tor toy try tub tui ulu urb uts yob you

bios birl biro bits blot blur boil bolo bolt boor boos boot bort boss bots bout boyo boys brio bris brit broo bros brut buoy burl burs bury buss bust busy buts buys byrl libs list lits litu lobo lobs loos loot lory loss lost loti lots lour lout lust obis obit obol oils oily olio oots orbs orby orts ours oust outs ribs riot robs roil root rosy roti rotl roto rots rout rubs ruby ruly rust ruts ryot sibs silo silt sirs sits slit slob slot slub slur slut sobs soil soli solo sols soot sorb sori sort sots soul sour sous soys sris stir stob stub subs suit sulu sybo syli tils tirl tiro toby toil tolu tool tori toro tors tory toss tour toyo toys trio troy tubs tuis tyro ulus urbs urus yobs your yous yurt