ponhb opnhb pnohb npohb onphb nophb pohnb ophnb phonb hponb ohpnb hopnb pnhob nphob phnob hpnob nhpob hnpob onhpb nohpb ohnpb honpb nhopb hnopb ponbh opnbh pnobh npobh onpbh nopbh pobnh opbnh pbonh bponh obpnh bopnh pnboh npboh pbnoh bpnoh nbpoh bnpoh onbph nobph obnph bonph nboph bnoph pohbn ophbn phobn hpobn ohpbn hopbn pobhn opbhn pbohn bpohn obphn bophn phbon hpbon pbhon bphon hbpon bhpon ohbpn hobpn obhpn bohpn hbopn bhopn pnhbo nphbo phnbo hpnbo nhpbo hnpbo pnbho npbho pbnho bpnho nbpho bnpho phbno hpbno pbhno bphno hbpno bhpno nhbpo hnbpo nbhpo bnhpo hbnpo bhnpo onhbp nohbp ohnbp honbp nhobp hnobp onbhp nobhp obnhp bonhp nbohp bnohp ohbnp hobnp obhnp bohnp hbonp bhonp nhbop hnbop nbhop bnhop hbnop bhnop
Note: these 'words' (valid or invalid) are all the permutations of the word ponhb. These words are obtained by scrambling the letters in ponhb.