prang rpang parng aprng rapng arpng prnag rpnag pnrag nprag rnpag nrpag panrg apnrg pnarg nparg anprg naprg ranpg arnpg rnapg nrapg anrpg narpg pragn rpagn pargn aprgn rapgn arpgn prgan rpgan pgran gpran rgpan grpan pagrn apgrn pgarn gparn agprn gaprn ragpn argpn rgapn grapn agrpn garpn prnga rpnga pnrga nprga rnpga nrpga prgna rpgna pgrna gprna rgpna grpna pngra npgra pgnra gpnra ngpra gnpra rngpa nrgpa rgnpa grnpa ngrpa gnrpa pangr apngr pnagr npagr anpgr napgr pagnr apgnr pganr gpanr agpnr gapnr pngar npgar pgnar gpnar ngpar gnpar angpr nagpr agnpr ganpr ngapr gnapr rangp arngp rnagp nragp anrgp nargp ragnp argnp rganp granp agrnp garnp rngap nrgap rgnap grnap ngrap gnrap angrp nagrp agnrp ganrp ngarp gnarp
Note: these 'words' (valid or invalid) are all the permutations of the word prang. These words are obtained by scrambling the letters in prang.