octad cotad otcad tocad ctoad tcoad ocatd coatd oactd aoctd caotd acotd otacd toacd oatcd aotcd taocd atocd ctaod tcaod catod actod tacod atcod octda cotda otcda tocda ctoda tcoda ocdta codta odcta docta cdota dcota otdca todca odtca dotca tdoca dtoca ctdoa tcdoa cdtoa dctoa tdcoa dtcoa ocadt coadt oacdt aocdt caodt acodt ocdat codat odcat docat cdoat dcoat oadct aodct odact doact adoct daoct cadot acdot cdaot dcaot adcot dacot otadc toadc oatdc aotdc taodc atodc otdac todac odtac dotac tdoac dtoac oadtc aodtc odatc doatc adotc daotc tadoc atdoc tdaoc dtaoc adtoc datoc ctado tcado catdo actdo tacdo atcdo ctdao tcdao cdtao dctao tdcao dtcao cadto acdto cdato dcato adcto dacto tadco atdco tdaco dtaco adtco datco
Note: these 'words' (valid or invalid) are all the permutations of the word octad. These words are obtained by scrambling the letters in octad.