BIRTHSTOOL

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bio bis bit boo bos bot bro his hit hob hos hot its lib lis lit lob loo lot obi oho ohs oil ooh oot orb ors ort rho rib rob rot sib sir sit sob sol sot sri tho til tis tit too tor tot

bios birl biro bits bitt blot boho boil bolo bolt boor boos boot bort bosh both bots bott brio bris brit broo bros hilt hist hits hobo hobs hols holt hoot host hots libs list lits lobo lobs loos loot lost loth loti lots obis obit obol oils olio oohs oots orbs orts otto rhos ribs riot robs roil root roti rotl roto rots shit shoo shot shri silo silt sith slit slob slot soil soli solo soot sorb sori sort soth stir stob stot thio thir this thro tils tilt tirl tiro tits toil toit tool toot tori toro tors tort tosh tost tots trio trot