ducat udcat dcuat cduat ucdat cudat duact udact dauct aduct uadct audct dcaut cdaut dacut adcut cadut acdut ucadt cuadt uacdt aucdt caudt acudt ducta udcta dcuta cduta ucdta cudta dutca udtca dtuca tduca utdca tudca dctua cdtua dtcua tdcua ctdua tcdua uctda cutda utcda tucda ctuda tcuda duatc udatc dautc adutc uadtc audtc dutac udtac dtuac tduac utdac tudac datuc adtuc dtauc tdauc atduc taduc uatdc autdc utadc tuadc atudc taudc dcatu cdatu dactu adctu cadtu acdtu dctau cdtau dtcau tdcau ctdau tcdau datcu adtcu dtacu tdacu atdcu tadcu catdu actdu ctadu tcadu atcdu tacdu ucatd cuatd uactd auctd cautd acutd uctad cutad utcad tucad ctuad tcuad uatcd autcd utacd tuacd atucd taucd catud actud ctaud tcaud atcud tacud
Note: these 'words' (valid or invalid) are all the permutations of the word ducat. These words are obtained by scrambling the letters in ducat.