a-a a-c aaa aac aao aar aav ac- aca acc aco acr acv aoa aoc aoo aor aov ar- ara arc aro arr arv av- ava avc avo avr c-- caa cac cao car cav cca ccc cco ccr ccv co- coa coc coo cor cov cra crc cro crr crv cva cvc cvo cvr cvv oaa oac oao oar oav oc- oca occ oco ocr ocv oo- ooa ooc ooo oor oov or- ora orc oro orr orv ov- ova ovc ovo ovv ra- raa rac rao rar rav rca rcc rco rcr rcv roa roc roo ror rov rra rrc rrr rva rvc rvo rvr rvv v-a vaa vac vao var vav vca vcc vco vcr voa voc voo vor vov vra vrc vrr vva vvc vvo vvr vvv