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10 letter words:

preference17,

9 letter words:

reference14,

7 letter words:

refence12, creeper11, referee10, preener9,

6 letter words:

fencer11, prefer11, reefer9,

5 letter words:

fence10, creep9, crepe9, pence9, freer8, frere8, refer8, preen7,

4 letter words:

cepe8, fere7, fern7, free7, reef7, cere6, epee6, neep6, peen6, peer6, pere6, pree6, erne4,

3 letter words:

cep7, pec7, fee6, fen6, fer6, ref6, cee5, pee5, pen5, per5, rec5, rep5, ere3, ern3, err3, nee3, ree3,

2 letter words:

ef5, fe5, pe4, en2, er2, ne2, re2,