How many five letter words can you make using s t p and two vowels?

The following Words, acceptable in International Scrabble, consist of the letters S, T, P, and two vowels:

ataps, estop, pasta, paste, pates, patus, peats, pesto, piets, piste, pitas, poets, poots, posit, potes, pouts, septa, setup, situp, spait, spate, speat, spoot, spout, sputa, steep, stipa, stipe, stoep, stoop, stope, stoup, stupa, stupe, tapas, tapes, tapis, tapus, tepas, tipis, topes, topis, topos, upset