a-a a-b a-c aaa aab aac aaj aak aao aar aav ab- aba abb abc abj abk abo abr abv ac- aca acb acc acj ack aco acr acv aja ajb ajc ajj ajk ajo ajr aka akb akc akj akk ako akr akv aoa aob aoc aoj aok aoo aor aov ar- ara arb arc arj ark aro arr arv av- ava avb avc avk avo avr baa bab bac baj bak bao bar bav bba bbb bbc bbk bbo bbr bca bcb bcc bcj bck bco bcr bcv bja bjc bjj bjk bjr bka bkb bkc bkk bko bkr bkv boa bob boc boj bok boo bor bov bra brb brj brk bro brr brv bva bvb bvc bvk bvo bvr bvv c-- c-j caa cab cac caj cak cao car cav cba cbb cbc cbj cbk cbo cbr cbv cca ccb ccc ccj cck cco ccr ccv cja cjb cjc cjk cjr cka ckb ckc cko co- coa cob coc coj cok coo cor cov cra crb crc crj crk cro crr crv cva cvb cvc cvk cvo cvr cvv jaa jab jac jaj jak jao jar jav jba jbc jbj jbk jbo jbr jca jcb jcc jck jco jcr jja jjb jjc jjj jjk jjr jka jkb jkk jko jkr jkv joa job joc joj jok joo jor jra jrb jrc jrk jro jrr jvb jvc ka- kaa kab kac kaj kak kao kar kav kba kbb kbc kbk kbo kbr kca kcb kcc kck kcr kjb kjc kjr kkb kkc kkk kkr kkv koa kob koc kok koo kor kra krc krk kro krr krv kva kvb kvk kvo kvr kvv oaa oab oac oaj oak oao oar oav ob- oba obb obc obj obk obo obr obv oc- oca ocb occ ocj ock oco ocr ocv oja ojb ojc ojo oka okb okc okj okk oko okr oo- ooa oob ooc ook ooo oor oov or- ora orb orc ork oro orr orv ov- ova ovb ovc ovo ovv ra- raa rab rac raj rak rao rar rav rba rbb rbc rbk rbo rbr rca rcb rcc rcj rco rcr rcv rja rjc rjk rjr rkb rkc rkk rko rkv roa rob roc roj rok roo ror rov rra rrb rrc rrk rrr rva rvb rvc rvo rvr rvv v-a vaa vab vac vaj vak vao var vav vba vbc vbk vbo vbr vbv vca vcc vco vcr vja vka vkb voa vob voc vok voo vor vov vra vrb vrc vrk vrr vva vvb vvc vvo vvr vvv