grins rgins girns igrns rigns irgns grnis rgnis gnris ngris rngis nrgis ginrs ignrs gnirs ngirs ingrs nigrs rings irngs rnigs nrigs inrgs nirgs grisn rgisn girsn igrsn rigsn irgsn grsin rgsin gsrin sgrin rsgin srgin gisrn igsrn gsirn sgirn isgrn sigrn risgn irsgn rsign srign isrgn sirgn grnsi rgnsi gnrsi ngrsi rngsi nrgsi grsni rgsni gsrni sgrni rsgni srgni gnsri ngsri gsnri sgnri nsgri sngri rnsgi nrsgi rsngi srngi nsrgi snrgi ginsr ignsr gnisr ngisr ingsr nigsr gisnr igsnr gsinr sginr isgnr signr gnsir ngsir gsnir sgnir nsgir sngir insgr nisgr isngr singr nsigr snigr rinsg irnsg rnisg nrisg inrsg nirsg risng irsng rsing sring isrng sirng rnsig nrsig rsnig srnig nsrig snrig insrg nisrg isnrg sinrg nsirg snirg
Note: these 'words' (valid or invalid) are all the permutations of the word grins. These words are obtained by scrambling the letters in grins.