a-a a-c aaa aac aak aao aar aau aav ac- aca acc ack aco acr acu acv aka akc akk ako akr aku akv aoa aoc aok aoo aor aou aov ar- ara arc ark aro arr aru arv au- aua auc auk auo aur auv av- ava avc avk avo avr avu c-- caa cac cak cao car cau cav cca ccc cck cco ccr ccu ccv cka ckc cko co- coa coc cok coo cor cou cov cra crc crk cro crr cru crv cua cuc cuk cuo cur cuu cuv cva cvc cvk cvo cvr cvu cvv ka- kaa kac kak kao kar kau kav kca kcc kck kcr kcu kkc kkk kkr kku kkv koa koc kok koo kor kou kra krc krk kro krr kru krv kuc kuk kur kuu kva kvk kvo kvr kvv oaa oac oak oao oar oau oav oc- oca occ ock oco ocr ocu ocv oka okc okk oko okr oku oo- ooa ooc ook ooo oor oov or- ora orc ork oro orr oru orv ou- oua ouc ouk ouo our ov- ova ovc ovo ovv ra- raa rac rak rao rar rau rav rca rcc rco rcr rcu rcv rkc rkk rko rku rkv roa roc rok roo ror rou rov rra rrc rrk rrr rru rua ruc ruk ruo rur ruu ruv rva rvc rvo rvr rvu rvv ua- uaa uac uak uao uar uau uav uca ucc uck uco ucr ucu ucv uka ukc ukk ukr uku uoa uoc uok uoo uor ur- ura urc urk uro urr uru uua uuc uur uuu uva uvc uvo uvu uvv v-a vaa vac vak vao var vau vav vca vcc vco vcr vcu vka voa voc vok voo vor vou vov vra vrc vrk vrr vru vuk vur vuv vva vvc vvo vvr vvv