PROTOPORPHYRINS

hi ho in is it no oh oi on op or os oy pi sh si so ti to yo

hin hip his hit hon hop hos hot hoy hyp ins ion its nip nit noh noo nor nos not nth oho ohs ono ons ooh oot ops opt ors ort phi pht pin pip pis pit poh poi poo pop pot pro pry psi pst rho rin rip rot shy sin sip sir sit son sop sot soy spy sri sty syn tho thy tin tip tis ton too top tor toy try yin yip yon

hins hint hips hisn hist hits hons hoop hoot hops horn host hots hoys hypo hyps inro into ions iron nips nits noir nori nosh nosy onos onto oohs oops oots opts orts phis phon phot pins pint piny pion pips pipy pirn pish piso pith pits pity pois pons pony pooh poon poop poor poos pops porn port posh post posy pots prop pros pyin pyro rhos rins riot rips root ropy rosy roti roto rots ryot shin ship shit shoo shop shot shri sinh sith snip snit snot soon soot soph sori sorn sort soth spin spit spot spry stir stop syph thin thio thir this thro tins tiny tips tiro tons tony toon toph topi topo tops tori torn toro torr tors tory tosh toyo toys trio trip trop troy tyin typo typp tyro yins yips yirr yoni