a-a a-c aaa aac aao aap aar aav ac- aca acc aco acp acr acv aoa aoc aoo aop aor aov ap- apa apc apo app apr apv ar- ara arc aro arp arr arv av- ava avc avo avp avr c-- caa cac cao cap car cav cca ccc cco ccp ccr ccv co- coa coc coo cop cor cov cpa cpc cpo cpp cpr cpv cra crc cro crp crr crv cva cvc cvo cvp cvr cvv oaa oac oao oap oar oav oc- oca occ oco ocp ocr ocv oo- ooa ooc ooo oop oor oov op- opa opc opo opp opr opv or- ora orc oro orp orr orv ov- ova ovc ovo ovp ovv p-p paa pac pao pap par pav pca pcc pco pcp pcr pcv poa poc poo pop por pov ppa ppc ppo ppp ppr ppv pra prc pro prp prr prv pva pvc pvo pvp pvr pvv ra- raa rac rao rap rar rav rca rcc rco rcp rcr rcv roa roc roo rop ror rov rpa rpc rpo rpp rpr rpv rra rrc rrp rrr rva rvc rvo rvp rvr rvv v-a vaa vac vao vap var vav vca vcc vco vcp vcr voa voc voo vop vor vov vpa vpc vpo vpp vpr vra vrc vrp vrr vva vvc vvo vvr vvv