a-a a-b a-c aaa aab aac aad aaj aak aao aas ab- aba abb abc abd abj abk abo abs ac- aca acb acc acd acj ack aco acs ad- ada adb adc add adj adk ado ads aja ajb ajc ajd ajj ajk ajo ajs aka akb akc akd akj akk ako aks aoa aob aoc aod aoj aok aoo aos as- asa asb asc asd asj ask aso ass baa bab bac bad baj bak bao bas bba bbb bbc bbd bbk bbo bbs bca bcb bcc bcd bcj bck bco bcs bda bdb bdc bdd bdj bdk bdo bds bja bjc bjd bjj bjk bjs bka bkb bkc bkk bko bks boa bob boc bod boj bok boo bos bsa bsb bsc bsd bsj bsk bso bss c-- c-j caa cab cac cad caj cak cao cas cba cbb cbc cbd cbj cbk cbo cbs cca ccb ccc ccd ccj cck cco ccs cda cdb cdc cdd cdj cdk cdo cds cja cjb cjc cjd cjk cjs cka ckb ckc ckd cko cks co- coa cob coc cod coj cok coo cos csa csb csc csd csj csk cso css daa dab dac dad daj dak dao das dba dbb dbc dbd dbk dbo dbs dca dcb dcc dcd dck dco dcs dda ddb ddc ddd ddk ddo dds dj- dja djb djc djd djk djo djs dka dkb dkc dkk dko dks doa dob doc dod doj dok doo dos dsa dsb dsc dsd dsj dsk dso dss j-d jaa jab jac jad jaj jak jao jas jba jbc jbj jbk jbo jbs jca jcb jcc jcd jck jco jcs jda jdb jdc jdo jds jja jjb jjc jjj jjk jjs jka jkb jkk jko jks joa job joc jod joj jok joo jos jsa jsb jsc jsd jsj jsk jso jss ka- kaa kab kac kad kaj kak kao kas kba kbb kbc kbd kbk kbo kbs kca kcb kcc kcd kck kcs kda kdb kdc kdk kdo kds kjb kjc kjs kkb kkc kkk kks koa kob koc kod kok koo kos ksa ksb ksc ksd ksk kso kss oaa oab oac oad oaj oak oao oas ob- oba obb obc obd obj obk obo obs oc- oca ocb occ ocd ocj ock oco ocs oda odb odc odd odo ods oja ojb ojc ojd ojo ojs oka okb okc okd okj okk oko oks oo- ooa oob ooc ood ook ooo oos os- osa osb osc osd osj osk oso oss saa sab sac sad saj sak sao sas sba sbb sbc sbd sbj sbk sbo sbs sca scb scc scd scj sck sco scs sda sdb sdc sdd sdj sdk sdo sds sja sjb sjc sjd sjj sjk sjs sk- ska skb skc skd skj skk sko sks soa sob soc sod soj sok soo sos ss- ssa ssb ssc ssd ssj ssk sso sss