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7 letter words:

cropper13,

6 letter words:

copper12, proper10,

5 letter words:

coper9, preop9, corer7, crore7, repro7, roper7,

4 letter words:

cope8, crop8, pepo8, perp8, pope8, prep8, prop8, repp8, cero6, core6, pore6, repo6, rope6,

3 letter words:

cep7, cop7, pec7, pep7, pop7, cor5, ope5, orc5, per5, pro5, rec5, rep5, roc5, err3, ore3, roe3,

2 letter words:

op4, pe4, er2, oe2, or2, re2,