cours ocurs cuors ucors oucrs uocrs corus ocrus crous rcous orcus rocus curos ucros cruos rcuos urcos rucos ourcs uorcs orucs roucs urocs ruocs cousr ocusr cuosr ucosr oucsr uocsr cosur ocsur csour scour oscur socur cusor ucsor csuor scuor uscor sucor ouscr uoscr osucr soucr usocr suocr corsu ocrsu crosu rcosu orcsu rocsu cosru ocsru csoru scoru oscru socru crsou rcsou csrou scrou rscou srcou orscu roscu osrcu sorcu rsocu srocu curso ucrso cruso rcuso urcso rucso cusro ucsro csuro scuro uscro sucro crsuo rcsuo csruo scruo rscuo srcuo ursco rusco usrco surco rsuco sruco oursc uorsc orusc rousc urosc ruosc ousrc uosrc osurc sourc usorc suorc orsuc rosuc osruc soruc rsouc srouc ursoc rusoc usroc suroc rsuoc sruoc
Note: these 'words' (valid or invalid) are all the permutations of the word cours. These words are obtained by scrambling the letters in cours.