a-a a-b a-c aaa aab aac aah aaj aak aao aas ab- aba abb abc abh abj abk abo abs ac- aca acb acc ach acj ack aco acs aha ahb ahc ahh ahj ahk aho ahs aja ajb ajc ajh ajj ajk ajo ajs aka akb akc akh akj akk ako aks aoa aob aoc aoh aoj aok aoo aos as- asa asb asc ash asj ask aso ass baa bab bac bah baj bak bao bas bba bbb bbc bbh bbk bbo bbs bca bcb bcc bch bcj bck bco bcs bha bhb bhc bhh bhj bhk bho bhs bja bjc bjj bjk bjs bka bkb bkc bkk bko bks boa bob boc boh boj bok boo bos bsa bsb bsc bsh bsj bsk bso bss c-- c-j caa cab cac cah caj cak cao cas cba cbb cbc cbh cbj cbk cbo cbs cca ccb ccc cch ccj cck cco ccs ch- cha chb chc chh chk cho chs cja cjb cjc cjk cjs cka ckb ckc ckh cko cks co- coa cob coc coh coj cok coo cos csa csb csc csh csj csk cso css haa hab hac hah haj hak hao has hba hbb hbc hbh hbj hbk hbo hbs hca hcb hcc hch hcj hck hco hcs hha hhb hhc hhh hhj hhk hho hhs hja hjk hjo hjs hka hkb hkh hkk hko hks hoa hob hoc hoh hok hoo hos hsa hsb hsc hsh hsj hsk hss jaa jab jac jah jaj jak jao jas jba jbc jbj jbk jbo jbs jca jcb jcc jch jck jco jcs jha jhc jhj jho jhs jja jjb jjc jjj jjk jjs jka jkb jkh jkk jko jks joa job joc joh joj jok joo jos jsa jsb jsc jsh jsj jsk jso jss ka- kaa kab kac kah kaj kak kao kas kba kbb kbc kbh kbk kbo kbs kca kcb kcc kch kck kcs kha khh khj khk kho khs kjb kjc kjs kkb kkc kkh kkk kks koa kob koc koh kok koo kos ksa ksb ksc ksh ksk kso kss oaa oab oac oah oaj oak oao oas ob- oba obb obc obh obj obk obo obs oc- oca ocb occ och ocj ock oco ocs oha ohc ohh oho ohs oja ojb ojc ojo ojs oka okb okc okj okk oko oks oo- ooa oob ooc ooh ook ooo oos os- osa osb osc osh osj osk oso oss saa sab sac sah saj sak sao sas sba sbb sbc sbh sbj sbk sbo sbs sca scb scc sch scj sck sco scs sh- sha shb shc shh shk sho shs sja sjb sjc sjh sjj sjk sjs sk- ska skb skc skh skj skk sko sks soa sob soc soh soj sok soo sos ss- ssa ssb ssc ssh ssj ssk sso sss