pbtea bptea ptbea tpbea btpea tbpea pbeta bpeta pebta epbta bepta ebpta pteba tpeba petba eptba tepba etpba btepa tbepa betpa ebtpa tebpa etbpa pbtae bptae ptbae tpbae btpae tbpae pbate bpate pabte apbte bapte abpte ptabe tpabe patbe aptbe tapbe atpbe btape tbape batpe abtpe tabpe atbpe pbeat bpeat pebat epbat bepat ebpat pbaet bpaet pabet apbet bapet abpet peabt epabt paebt apebt eapbt aepbt beapt ebapt baept abept eabpt aebpt pteab tpeab petab eptab tepab etpab ptaeb tpaeb pateb apteb tapeb atpeb peatb epatb paetb apetb eaptb aeptb teapb etapb taepb atepb eatpb aetpb bteap tbeap betap ebtap tebap etbap btaep tbaep batep abtep tabep atbep beatp ebatp baetp abetp eabtp aebtp teabp etabp taebp atebp eatbp aetbp
Note: these 'words' (valid or invalid) are all the permutations of the word pbtea. These words are obtained by scrambling the letters in pbtea.