ORNISCOPIST

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cis con coo cop cor cos cot ins ion its nip nit noo nor nos not ono ons oot ops opt orc ors ort pic pin pis pit poi poo pot pro psi pst rin rip roc rot sic sin sip sir sis sit son sop sos sot sri tic tin tip tis ton too top tor

cion cist coin coir coni cons coon coop coos coot cops corn cors coss cost cots cris crit crop icon inro inti into ions iris iron nips nisi nits noir nori onos onto oops oots opts orcs orts otic pics pins pint pion pirn piso piss pits poco pois pons poon poor poos porn port post pots pros psis psst rins riot rips rocs root roti roto rots scop scot sics sins sips sirs sits snip snit snot sons soon soot sops sori sorn sort sots spic spin spit spot sris stir stop tics tins tipi tips tiro tons toon topi topo tops torc tori torn toro tors toss trio trip trop