churl hcurl cuhrl uchrl hucrl uhcrl chrul hcrul crhul rchul hrcul rhcul curhl ucrhl cruhl rcuhl urchl ruchl hurcl uhrcl hrucl rhucl urhcl ruhcl chulr hculr cuhlr uchlr huclr uhclr chlur hclur clhur lchur hlcur lhcur culhr uclhr cluhr lcuhr ulchr luchr hulcr uhlcr hlucr lhucr ulhcr luhcr chrlu hcrlu crhlu rchlu hrclu rhclu chlru hclru clhru lchru hlcru lhcru crlhu rclhu clrhu lcrhu rlchu lrchu hrlcu rhlcu hlrcu lhrcu rlhcu lrhcu curlh ucrlh crulh rculh urclh ruclh culrh uclrh clurh lcurh ulcrh lucrh crluh rcluh clruh lcruh rlcuh lrcuh urlch rulch ulrch lurch rluch lruch hurlc uhrlc hrulc rhulc urhlc ruhlc hulrc uhlrc hlurc lhurc ulhrc luhrc hrluc rhluc hlruc lhruc rlhuc lrhuc urlhc rulhc ulrhc lurhc rluhc lruhc
Note: these 'words' (valid or invalid) are all the permutations of the word churl. These words are obtained by scrambling the letters in churl.