a-a a-b a-c aaa aab aac aah aaj aan aao aas ab- aba abb abc abh abj abn abo abs ac- aca acb acc ach acj acn aco acs aha ahb ahc ahh ahj ahn aho ahs aja ajb ajc ajh ajj ajn ajo ajs an- ana anb anc anh anj ann ano ans aoa aob aoc aoh aoj aon aoo aos as- asa asb asc ash asj asn aso ass baa bab bac bah baj ban bao bas bba bbb bbc bbh bbn bbo bbs bca bcb bcc bch bcj bcn bco bcs bha bhb bhc bhh bhj bho bhs bja bjc bjj bjn bjs bna bnb bnc bnj bnn bno bns boa bob boc boh boj bon boo bos bsa bsb bsc bsh bsj bsn bso bss c-- c-j caa cab cac cah caj can cao cas cba cbb cbc cbh cbj cbn cbo cbs cca ccb ccc cch ccj ccn cco ccs ch- cha chb chc chh chn cho chs cja cjb cjc cjs cn- cna cnb cnc cnh cnj cnn cno cns co- coa cob coc coh coj con coo cos csa csb csc csh csj csn cso css haa hab hac hah haj han hao has hba hbb hbc hbh hbj hbn hbo hbs hca hcb hcc hch hcj hcn hco hcs hha hhb hhc hhh hhj hhn hho hhs hja hjn hjo hjs hna hnb hnc hnh hnj hnn hno hns hoa hob hoc hoh hon hoo hos hsa hsb hsc hsh hsj hsn hss jaa jab jac jah jaj jan jao jas jba jbc jbj jbo jbs jca jcb jcc jch jco jcs jha jhc jhj jhn jho jhs jja jjb jjc jjj jjs jna jnc jnh jnj jnn jno jns joa job joc joh joj jon joo jos jsa jsb jsc jsh jsj jsn jso jss naa nab nac nah naj nan nao nas nba nbb nbc nbn nbo nbs nca ncb ncc nch ncn nco ncs nha nhb nhc nhh nhj nhn nhs nja njc njn njs nna nnb nnc nnh nnn nno nns no- noa nob noc noh noj non noo nos nsa nsb nsc nsh nsn nso nss oaa oab oac oah oaj oan oao oas ob- oba obb obc obh obj obn obo obs oc- oca ocb occ och ocj ocn oco ocs oha ohc ohh ohn oho ohs oja ojb ojc ojo ojs on- ona onb onc onh onj onn ono ons oo- ooa oob ooc ooh oon ooo oos os- osa osb osc osh osj osn oso oss saa sab sac sah saj san sao sas sba sbb sbc sbh sbj sbn sbo sbs sca scb scc sch scj scn sco scs sh- sha shb shc shh shn sho shs sja sjb sjc sjh sjj sjs sna snb snc snj snn sno sns soa sob soc soh soj son soo sos ss- ssa ssb ssc ssh ssj ssn sso sss