grens rgens gerns egrns regns ergns grnes rgnes gnres ngres rnges nrges genrs egnrs gners ngers engrs negrs rengs erngs rnegs nregs enrgs nergs gresn rgesn gersn egrsn regsn ergsn grsen rgsen gsren sgren rsgen srgen gesrn egsrn gsern sgern esgrn segrn resgn ersgn rsegn sregn esrgn sergn grnse rgnse gnrse ngrse rngse nrgse grsne rgsne gsrne sgrne rsgne srgne gnsre ngsre gsnre sgnre nsgre sngre rnsge nrsge rsnge srnge nsrge snrge gensr egnsr gnesr ngesr engsr negsr gesnr egsnr gsenr sgenr esgnr segnr gnser ngser gsner sgner nsger snger ensgr nesgr esngr sengr nsegr snegr rensg ernsg rnesg nresg enrsg nersg resng ersng rseng sreng esrng serng rnseg nrseg rsneg srneg nsreg snreg ensrg nesrg esnrg senrg nserg snerg
Note: these 'words' (valid or invalid) are all the permutations of the word grens. These words are obtained by scrambling the letters in grens.