ocker coker okcer kocer ckoer kcoer ocekr coekr oeckr eockr ceokr ecokr okecr koecr oekcr eokcr keocr ekocr ckeor kceor cekor eckor kecor ekcor ockre cokre okcre kocre ckore kcore ocrke corke orcke rocke croke rcoke okrce korce orkce rokce kroce rkoce ckroe kcroe crkoe rckoe krcoe rkcoe ocerk coerk oecrk eocrk ceork ecork ocrek corek orcek rocek croek rcoek oerck eorck oreck roeck erock reock cerok ecrok creok rceok ercok recok okerc koerc oekrc eokrc keorc ekorc okrec korec orkec rokec kroec rkoec oerkc eorkc orekc roekc erokc reokc keroc ekroc kreoc rkeoc erkoc rekoc ckero kcero cekro eckro kecro ekcro ckreo kcreo crkeo rckeo krceo rkceo cerko ecrko creko rceko ercko recko kerco ekrco kreco rkeco erkco rekco
Note: these 'words' (valid or invalid) are all the permutations of the word ocker. These words are obtained by scrambling the letters in ocker.