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4 letter words:

zerk17, zero13, kero8, kore8, reek8, reke8, roke8,

3 letter words:

zek16, rez12, zee12, eek7, eke7, erk7, kor7, oke7, rok7, ere3, ore3, ree3, reo3, roe3,

2 letter words:

zo11, ko6, ee2, er2, oe2, or2, re2,