a-a a-c aaa aac aak aao aap aav ac- aca acc ack aco acp acv aka akc akk ako akp akv aoa aoc aok aoo aop aov ap- apa apc apk apo app apv av- ava avc avk avo avp c-- caa cac cak cao cap cav cca ccc cck cco ccp ccv cka ckc cko co- coa coc cok coo cop cov cpa cpc cpk cpo cpp cpv cva cvc cvk cvo cvp cvv ka- kaa kac kak kao kap kav kca kcc kck kcp kkc kkk kkp kkv koa koc kok koo kop kpa kpc kpk kpo kpp kpv kva kvk kvo kvp kvv oaa oac oak oao oap oav oc- oca occ ock oco ocp ocv oka okc okk oko okp oo- ooa ooc ook ooo oop oov op- opa opc opk opo opp opv ov- ova ovc ovo ovp ovv p-p paa pac pak pao pap pav pca pcc pck pco pcp pcv pka pkc pko pkp poa poc pok poo pop pov ppa ppc ppk ppo ppp ppv pva pvc pvk pvo pvp pvv v-a vaa vac vak vao vap vav vca vcc vco vcp vka vkp voa voc vok voo vop vov vpa vpc vpk vpo vpp vva vvc vvo vvv