a-a a-b a-c aaa aab aac aaj aak aao aas aav ab- aba abb abc abj abk abo abs abv ac- aca acb acc acj ack aco acs acv aja ajb ajc ajj ajk ajo ajs aka akb akc akj akk ako aks akv aoa aob aoc aoj aok aoo aos aov as- asa asb asc asj ask aso ass asv av- ava avb avc avk avo avs baa bab bac baj bak bao bas bav bba bbb bbc bbk bbo bbs bca bcb bcc bcj bck bco bcs bcv bja bjc bjj bjk bjs bka bkb bkc bkk bko bks bkv boa bob boc boj bok boo bos bov bsa bsb bsc bsj bsk bso bss bsv bva bvb bvc bvk bvo bvs bvv c-- c-j caa cab cac caj cak cao cas cav cba cbb cbc cbj cbk cbo cbs cbv cca ccb ccc ccj cck cco ccs ccv cja cjb cjc cjk cjs cka ckb ckc cko cks co- coa cob coc coj cok coo cos cov csa csb csc csj csk cso css csv cva cvb cvc cvk cvo cvs cvv jaa jab jac jaj jak jao jas jav jba jbc jbj jbk jbo jbs jca jcb jcc jck jco jcs jja jjb jjc jjj jjk jjs jka jkb jkk jko jks jkv joa job joc joj jok joo jos jsa jsb jsc jsj jsk jso jss jsv jvb jvc jvs ka- kaa kab kac kaj kak kao kas kav kba kbb kbc kbk kbo kbs kca kcb kcc kck kcs kjb kjc kjs kkb kkc kkk kks kkv koa kob koc kok koo kos ksa ksb ksc ksk kso kss ksv kva kvb kvk kvo kvs kvv oaa oab oac oaj oak oao oas oav ob- oba obb obc obj obk obo obs obv oc- oca ocb occ ocj ock oco ocs ocv oja ojb ojc ojo ojs oka okb okc okj okk oko oks oo- ooa oob ooc ook ooo oos oov os- osa osb osc osj osk oso oss osv ov- ova ovb ovc ovo ovs ovv saa sab sac saj sak sao sas sav sba sbb sbc sbj sbk sbo sbs sbv sca scb scc scj sck sco scs scv sja sjb sjc sjj sjk sjs sk- ska skb skc skj skk sko sks soa sob soc soj sok soo sos sov ss- ssa ssb ssc ssj ssk sso sss ssv sva svb svc svk svo svs svv v-a vaa vab vac vaj vak vao vas vav vba vbc vbk vbo vbs vbv vca vcc vco vcs vja vjs vka vkb voa vob voc vok voo vos vov vsa vsb vsc vsk vso vss vsv vva vvb vvc vvo vvs vvv