a-a a-c a-z aaa aac aao aar aav aaz ac- aca acc aco acr acv acz aoa aoc aoo aor aov ar- ara arc aro arr arv arz av- ava avc avo avr avz az- aza azo azz c-- caa cac cao car cav caz cca ccc cco ccr ccv ccz co- coa coc coo cor cov coz cra crc cro crr crv crz cva cvc cvo cvr cvv cvz cz- czc czo oaa oac oao oar oav oc- oca occ oco ocr ocv ocz oo- ooa ooc ooo oor oov or- ora orc oro orr orv orz ov- ova ovc ovo ovv oza ozo ozz ra- raa rac rao rar rav raz rca rcc rco rcr rcv roa roc roo ror rov roz rra rrc rrr rva rvc rvo rvr rvv rza rzo v-a vaa vac vao var vav vaz vca vcc vco vcr voa voc voo vor vov voz vra vrc vrr vva vvc vvo vvr vvv vvz zaa zac zao zar zav zaz zco zo- zoa zoc zoo zor zro zzr zzz