runts urnts rnuts nruts unrts nurts rutns urtns rtuns truns utrns turns rntus nrtus rtnus trnus ntrus tnrus untrs nutrs utnrs tunrs nturs tnurs runst urnst rnust nrust unrst nurst rusnt ursnt rsunt srunt usrnt surnt rnsut nrsut rsnut srnut nsrut snrut unsrt nusrt usnrt sunrt nsurt snurt rutsn urtsn rtusn trusn utrsn tursn rustn urstn rsutn srutn usrtn surtn rtsun trsun rstun srtun tsrun strun utsrn tusrn ustrn sutrn tsurn sturn rntsu nrtsu rtnsu trnsu ntrsu tnrsu rnstu nrstu rsntu srntu nsrtu snrtu rtsnu trsnu rstnu srtnu tsrnu strnu ntsru tnsru nstru sntru tsnru stnru untsr nutsr utnsr tunsr ntusr tnusr unstr nustr usntr suntr nsutr snutr utsnr tusnr ustnr sutnr tsunr stunr ntsur tnsur nstur sntur tsnur stnur
Note: these 'words' (valid or invalid) are all the permutations of the word runts. These words are obtained by scrambling the letters in runts.