OPERATISE

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aero airs airt aits aper apes apos apse ares arse arts ates atop ears ease east eats epos eras eros erst etas iota ires oars oast oats opes opts ores orts osar pair pare pars part pase past pate pats pear peas peat peer pees pere peri pert peso pest pets pias pier pies piso pita pits poet pois pore port pose post pots prao prat pree proa pros rais rape raps rapt rase rasp rate rato rats reap rees reis repo reps rest rete rets rias riot ripe rips rise rite roes rope rose rota rote roti rots sari sate sati sear seat seep seer sept sera sere seta sipe sire site soap soar sora sore sori sort spae spar spat spit spot star step stir stoa stop taos tape taps tare taro tarp tars tear teas tees tepa tier ties tips tire tiro toea toes tope topi tops tora tore tori tors trap tree tres trio trip trop tsar