How many words with 4 letters can you make out of the word representative?

Ains airn airs airt aits anes anis ante anti ants aper apes apse ares arts ates aver aves earn ears ease east eats eave epee eras erne erns errs erst etas etna even ever eves ires nape naps nave neap near neat neep nest nets nett neve nevi nipa nips nite nits pain pair pane pans pant pare parr pars part pase past pate pats pave pean pear peas peat peen peer pees pein pens pent peri pert pest pets pian pias pier pies pina pine pins pint pirn pita pits prat pree rain rani rant rape raps rapt rare rase rasp rate rats rave reap rear rees rein reis rent reps rest rete rets revs rias rins ripe rips rise rite rive sain sane sari sate sati save sear seat seen seep seer sene sent sept sera sere seta sett sine sipe sire site snap snip snit spae span spar spat spin spit spiv star stat step stet stir tain tans tape taps tare tarn tarp tars tart tate tats tavs tear teas teat teen tees tens tent tepa tern test tets tier ties tine tins tint tips tire trap tree tret trip tsar vain vair vane vans vars vase vast vats veep veer vees vein vena vent vera vert vest vets vier vies vina vine vins visa vise vita