a-a a-b a-c aaa aab aac aaj aak aam aao aas ab- aba abb abc abj abk abm abo abs ac- aca acb acc acj ack acm aco acs aja ajb ajc ajj ajk ajm ajo ajs aka akb akc akj akk akm ako aks ama amb amc amk amm amo ams aoa aob aoc aoj aok aom aoo aos as- asa asb asc asj ask asm aso ass baa bab bac baj bak bam bao bas bba bbb bbc bbk bbm bbo bbs bca bcb bcc bcj bck bcm bco bcs bja bjc bjj bjk bjm bjs bka bkb bkc bkk bkm bko bks bma bmb bmc bmj bmk bmm bmo bms boa bob boc boj bok bom boo bos bsa bsb bsc bsj bsk bsm bso bss c-- c-j caa cab cac caj cak cam cao cas cba cbb cbc cbj cbk cbm cbo cbs cca ccb ccc ccj cck ccm cco ccs cja cjb cjc cjk cjs cka ckb ckc ckm cko cks cma cmb cmc cmj cmk cmm cmo cms co- coa cob coc coj cok com coo cos csa csb csc csj csk csm cso css jaa jab jac jaj jak jam jao jas jba jbc jbj jbk jbm jbo jbs jca jcb jcc jck jcm jco jcs jja jjb jjc jjj jjk jjs jka jkb jkk jkm jko jks jma jmb jmc jmj jmm jmo jms joa job joc joj jok jom joo jos jsa jsb jsc jsj jsk jsm jso jss ka- kaa kab kac kaj kak kam kao kas kba kbb kbc kbk kbm kbo kbs kca kcb kcc kck kcm kcs kjb kjc kjs kkb kkc kkk kkm kks kma kmb kmc kmj kmk kmm kmo kms koa kob koc kok kom koo kos ksa ksb ksc ksk ksm kso kss m-o maa mab mac maj mak mam mao mas mba mbb mbc mbj mbk mbm mbo mbs mc- mca mcb mcc mck mcm mco mcs mjb mjc mjj mjk mjm mjs mka mkb mkc mkk mkm mko mks mma mmb mmc mmj mmk mmm mmo mms moa mob moc mok mom moo mos msa msb msc msj msk msm mso mss oaa oab oac oaj oak oam oao oas ob- oba obb obc obj obk obm obo obs oc- oca ocb occ ocj ock ocm oco ocs oja ojb ojc ojm ojo ojs oka okb okc okj okk oko oks om- oma omb omc omj omm omo oms oo- ooa oob ooc ook oom ooo oos os- osa osb osc osj osk osm oso oss saa sab sac saj sak sam sao sas sba sbb sbc sbj sbk sbm sbo sbs sca scb scc scj sck scm sco scs sja sjb sjc sjj sjk sjm sjs sk- ska skb skc skj skk skm sko sks sma smb smc smk smm smo sms soa sob soc soj sok som soo sos ss- ssa ssb ssc ssj ssk ssm sso sss