spank psank sapnk aspnk pasnk apsnk spnak psnak snpak nspak pnsak npsak sanpk asnpk snapk nsapk anspk naspk pansk apnsk pnask npask anpsk napsk spakn psakn sapkn aspkn paskn apskn spkan pskan skpan kspan pksan kpsan sakpn askpn skapn ksapn akspn kaspn paksn apksn pkasn kpasn akpsn kapsn spnka psnka snpka nspka pnska npska spkna pskna skpna kspna pksna kpsna snkpa nskpa sknpa ksnpa nkspa knspa pnksa npksa pknsa kpnsa nkpsa knpsa sankp asnkp snakp nsakp anskp naskp saknp asknp skanp ksanp aksnp kasnp snkap nskap sknap ksnap nksap knsap anksp naksp aknsp kansp nkasp knasp panks apnks pnaks npaks anpks napks pakns apkns pkans kpans akpns kapns pnkas npkas pknas kpnas nkpas knpas ankps nakps aknps kanps nkaps knaps
Note: these 'words' (valid or invalid) are all the permutations of the word spank. These words are obtained by scrambling the letters in spank.