runch urnch rnuch nruch unrch nurch rucnh urcnh rcunh crunh ucrnh curnh rncuh nrcuh rcnuh crnuh ncruh cnruh uncrh nucrh ucnrh cunrh ncurh cnurh runhc urnhc rnuhc nruhc unrhc nurhc ruhnc urhnc rhunc hrunc uhrnc hurnc rnhuc nrhuc rhnuc hrnuc nhruc hnruc unhrc nuhrc uhnrc hunrc nhurc hnurc ruchn urchn rcuhn cruhn ucrhn curhn ruhcn urhcn rhucn hrucn uhrcn hurcn rchun crhun rhcun hrcun chrun hcrun uchrn cuhrn uhcrn hucrn churn hcurn rnchu nrchu rcnhu crnhu ncrhu cnrhu rnhcu nrhcu rhncu hrncu nhrcu hnrcu rchnu crhnu rhcnu hrcnu chrnu hcrnu nchru cnhru nhcru hncru chnru hcnru unchr nuchr ucnhr cunhr ncuhr cnuhr unhcr nuhcr uhncr huncr nhucr hnucr uchnr cuhnr uhcnr hucnr chunr hcunr nchur cnhur nhcur hncur chnur hcnur
Note: these 'words' (valid or invalid) are all the permutations of the word runch. These words are obtained by scrambling the letters in runch.