a-a a-c aaa aac aao aap aav ac- aca acc aco acp acv aoa aoc aoo aop aov ap- apa apc apo app apv av- ava avc avo avp c-- caa cac cao cap cav cca ccc cco ccp ccv co- coa coc coo cop cov cpa cpc cpo cpp cpv cva cvc cvo cvp cvv oaa oac oao oap oav oc- oca occ oco ocp ocv oo- ooa ooc ooo oop oov op- opa opc opo opp opv ov- ova ovc ovo ovp ovv p-p paa pac pao pap pav pca pcc pco pcp pcv poa poc poo pop pov ppa ppc ppo ppp ppv pva pvc pvo pvp pvv v-a vaa vac vao vap vav vca vcc vco vcp voa voc voo vop vov vpa vpc vpo vpp vva vvc vvo vvv