a-a a-c a-t aaa aac aao aar aat aav ac- aca acc aco acr act acv aoa aoc aoo aor aot aov ar- ara arc aro arr art arv at- ata atc ato atr att atv av- ava avc avo avr avt c-- caa cac cao car cat cav cca ccc cco ccr cct ccv co- coa coc coo cor cot cov cra crc cro crr crt crv cta ctc cto ctr ctt ctv cva cvc cvo cvr cvt cvv oaa oac oao oar oat oav oc- oca occ oco ocr oct ocv oo- ooa ooc ooo oor oot oov or- ora orc oro orr ort orv ot- ota otc oto otr ott otv ov- ova ovc ovo ovv ra- raa rac rao rar rat rav rca rcc rco rcr rct rcv roa roc roo ror rot rov rra rrc rrr rrt rta rtc rto rtr rtt rtv rva rvc rvo rvr rvt rvv taa tac tao tar tat tav tca tcc tco tcr tct tcv to- toa toc too tor tot tov tra trc tro trr trt trv tta ttc tto ttr ttt ttv tva tvc tvo tvr tvt v-a vaa vac vao var vat vav vca vcc vco vcr vct voa voc voo vor vot vov vra vrc vrr vrt vta vtc vto vtr vtt vtv vva vvc vvo vvr vvt vvv