a-a a-c aaa aac aao aar aas aav ac- aca acc aco acr acs acv aoa aoc aoo aor aos aov ar- ara arc aro arr ars arv as- asa asc aso asr ass asv av- ava avc avo avr avs c-- caa cac cao car cas cav cca ccc cco ccr ccs ccv co- coa coc coo cor cos cov cra crc cro crr crs crv csa csc cso csr css csv cva cvc cvo cvr cvs cvv oaa oac oao oar oas oav oc- oca occ oco ocr ocs ocv oo- ooa ooc ooo oor oos oov or- ora orc oro orr ors orv os- osa osc oso osr oss osv ov- ova ovc ovo ovs ovv ra- raa rac rao rar ras rav rca rcc rco rcr rcs rcv roa roc roo ror ros rov rra rrc rrr rrs rsa rsc rso rsr rss rsv rva rvc rvo rvr rvs rvv saa sac sao sar sas sav sca scc sco scr scs scv soa soc soo sor sos sov sr- sra src sro srr srs srv ss- ssa ssc sso ssr sss ssv sva svc svo svr svs svv v-a vaa vac vao var vas vav vca vcc vco vcr vcs voa voc voo vor vos vov vra vrc vrr vrs vsa vsc vso vsr vss vsv vva vvc vvo vvr vvs vvv