udocs duocs uodcs oudcs doucs oducs udcos ducos ucdos cudos dcuos cduos uocds oucds ucods cuods ocuds couds docus odcus dcous cdous ocdus codus udosc duosc uodsc oudsc dousc odusc udsoc dusoc usdoc sudoc dsuoc sduoc uosdc ousdc usodc suodc osudc soudc dosuc odsuc dsouc sdouc osduc soduc udcso ducso ucdso cudso dcuso cduso udsco dusco usdco sudco dsuco sduco ucsdo cusdo uscdo sucdo csudo scudo dcsuo cdsuo dscuo sdcuo csduo scduo uocsd oucsd ucosd cuosd ocusd cousd uoscd ouscd usocd suocd osucd soucd ucsod cusod uscod sucod csuod scuod ocsud cosud oscud socud csoud scoud docsu odcsu dcosu cdosu ocdsu codsu doscu odscu dsocu sdocu osdcu sodcu dcsou cdsou dscou sdcou csdou scdou ocsdu cosdu oscdu socdu csodu scodu
Note: these 'words' (valid or invalid) are all the permutations of the word udocs. These words are obtained by scrambling the letters in udocs.