aaaa aaap aaav aaoo aapa aapo aapt aata aatt aava aopo apao apap apat apo- apoo apop apot appa appt apta aptt aptv at-t ataa atap atat atop atot atta atto attp avao avat avot avva avvo ooaa oooo ootp opap opo- oppa oppo opto otap oto- otoo otov otpp otta otto ovo- ovoo ovot ovpp paap paat papa papp pata pato patt pava pavo poat poop poot pop- popa popo popp popt pota poto pott povo ppap ppoa pppa pppo pppp ppta pptt pptv ptop pvpa taa- taat taoa tapa tapo tapp tapt tata tato tatt tatv tava tavo toat tooa toot top- topa topo topp topt topv tota toto tott tova tovo tpap tppa tppp tptp ttop tttt tvpa tvtv vaat vapa vata vato vatt vava voat voot vopt vota voto votp vpat vtap vvvv