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6 letter words:

expire15,

4 letter words:

prex13, peer6, pere6, peri6, pier6, pree6, ripe6,

3 letter words:

pix12, rex10, pee5, per5, pie5, pir5, pre5, rep5, rip5, ere3, ire3, ree3, rei3,

2 letter words:

ex9, xi9, pe4, pi4, ee2, er2, re2,