aaaa aaab aaac aaap aaba aabb aabc aabp aabt aaca aacb aacc aaco aacp aact aaoo aapa aapc aapo aapt aata aatc aatt abaa abab abac abap abat abb- abba abbb abbo abbt abca abcb abcc abcp abct aboa abob aboo abot abpa abpc abpp abta ac-t acaa acab acac acap acat acba acca accc acco accp acct acoa acop acot acpa acpt acta actc acto actt aoba aoca aopo aotc apac apao apap apat apba apca apcb apcc apco apo- apoc apoo apop apot appa appc appt apta aptc aptt at-t ataa atab atac atap atat atca atcc atco atob atoc atop atot atta atto attp baaa baat baba babb babo bac- baca bacc baco bact bapa bapc bapp bapt bata batc bato batt bbbb bcaa bcap bcat bcbc bcbp bcca bccc bcpp bctc boab boac boat boba bobb bobo boca boco boob booc boop boot bopa bopp bota botb boto bott bpcp bpot btaa btbp btcc btob bttb c-bo caaa caab caac caap caat caba cabo cac- caca cacc caco capa capb capc capo capp capt cat- cata catb catc cato catt cbac cbat cbbc cbca cbcc cbcp cbct cbot cbpc cbpp cbta cbtc ccaa ccab ccac ccap ccat ccba ccbc ccca cccb cccc cccp ccob ccoc ccpa ccpp cctb cctc cctt coat coba cobb cobo coca coco cocp coct coob coop coot copa copo copp copt cota cotb cotc coto cott cpaa cpac cpap cpbc cpca cppa cptp ctab ctba ctca ctcp ctot ctpo ctpp ctta obba obbo obot ocab ocac ocap ocat ocbc occa occc occt ocpa ocpp oct- octa octo ooaa ooba oooo ootb ootp opap opca opo- oppa oppo opto otac otap oto- otoo otpp otta otto paap paat paba pabt paca paco pact paoc papa papb papp pata pato patt pbac pbcc pboc pbpa pcaa pcap pcba pcbc pcca pccc pcoa pcpb pcpp poat poba pobo poca poco poop poot pop- popa popc popo popp popt pota potc poto pott ppac ppap ppcc ppoa pppa pppo pppp ppta pptt ptab ptca ptcc ptop pttc taa- taat taba tabb tabc tabo taca tacc taco tact taoa tapa tapo tapp tapt tata tatb tato tatt tbca tbcb tbcc tbta tbtp tcap tcca tccc tcpa tcpo tctc toab toat toba tobo tobt toca toco tooa toot top- topa topo topp topt tota totc toto tott tpac tpap tpcp tppa tppp tptp ttab ttbb ttcp ttop tttt