pubco upbco pbuco bpuco ubpco bupco pucbo upcbo pcubo cpubo ucpbo cupbo pbcuo bpcuo pcbuo cpbuo bcpuo cbpuo ubcpo bucpo ucbpo cubpo bcupo cbupo puboc upboc pbuoc bpuoc ubpoc bupoc puobc upobc poubc opubc uopbc oupbc pbouc bpouc pobuc opbuc bopuc obpuc ubopc buopc uobpc oubpc boupc obupc pucob upcob pcuob cpuob ucpob cupob puocb upocb poucb opucb uopcb oupcb pcoub cpoub pocub opcub copub ocpub ucopb cuopb uocpb oucpb coupb ocupb pbcou bpcou pcbou cpbou bcpou cbpou pbocu bpocu pobcu opbcu bopcu obpcu pcobu cpobu pocbu opcbu copbu ocpbu bcopu cbopu bocpu obcpu cobpu ocbpu ubcop bucop ucbop cubop bcuop cbuop ubocp buocp uobcp oubcp boucp obucp ucobp cuobp uocbp oucbp coubp ocubp bcoup cboup bocup obcup cobup ocbup
Note: these 'words' (valid or invalid) are all the permutations of the word pubco. These words are obtained by scrambling the letters in pubco.