PROTOZOOLOGISTS

go is it li lo oi op or os pi si so ti to

gip git goo gor gos got its lip lis lit log loo lop lot oil oot ops opt ors ort pig pis pit poi pol poo pot pro psi pst rig rip rot sip sir sis sit sol sop sos sot sri til tip tis tit tog too top tor tot zig zip zit zoo

gilt gips girl giro girt gist gits glop goop goos gorp grip grit grot lips lisp list lits logo logs loop loos loot lops loss lost loti lots oils olio oops oots opts orts orzo otto pigs piso piss pits plot pois polo pols pool poor poos port post pots prig prog pros psis psst rigs riot rips ritz roil root roti rotl roto rots silo silt sips sirs sits slip slit slog slop slot soil soli solo sols soot sops sori sort sots spit spot sris stir stop stot tils tilt tips tirl tiro tits togs toil toit tool toot topi topo tops tori toro tors tort toss tost tots trig trio trip trog trop trot zigs zips zits zoos zori