a-a a-b a-c aaa aab aac aad aah aak aan aas ab- aba abb abc abd abh abk abn abs ac- aca acb acc acd ach ack acn acs ad- ada adb adc add adh adk adn ads aha ahb ahc ahd ahh ahk ahn ahs aka akb akc akd akh akk akn aks an- ana anb anc and anh ank ann ans as- asa asb asc asd ash ask asn ass baa bab bac bad bah bak ban bas bba bbb bbc bbd bbh bbk bbn bbs bca bcb bcc bcd bch bck bcn bcs bda bdb bdc bdd bdh bdk bds bha bhb bhc bhd bhh bhk bhs bka bkb bkc bkk bkn bks bna bnb bnc bnd bnk bnn bns bsa bsb bsc bsd bsh bsk bsn bss c-- caa cab cac cad cah cak can cas cba cbb cbc cbd cbh cbk cbn cbs cca ccb ccc ccd cch cck ccn ccs cda cdb cdc cdd cdh cdk cdn cds ch- cha chb chc chd chh chk chn chs cka ckb ckc ckd ckh cks cn- cna cnb cnc cnd cnh cnn cns csa csb csc csd csh csk csn css daa dab dac dad dah dak dan das dba dbb dbc dbd dbh dbk dbn dbs dca dcb dcc dcd dck dcn dcs dda ddb ddc ddd ddh ddk ddn dds dh- dha dhb dhc dhd dhh dhk dhs dka dkb dkc dkk dks dna dnb dnc dnd dnh dnk dnn dns dsa dsb dsc dsd dsh dsk dsn dss haa hab hac had hah hak han has hba hbb hbc hbd hbh hbk hbn hbs hca hcb hcc hcd hch hck hcn hcs hda hdb hdc hdd hdh hdk hdn hds hha hhb hhc hhd hhh hhk hhn hhs hka hkb hkd hkh hkk hkn hks hna hnb hnc hnd hnh hnk hnn hns hsa hsb hsc hsd hsh hsk hsn hss ka- kaa kab kac kad kah kak kan kas kba kbb kbc kbd kbh kbk kbn kbs kca kcb kcc kcd kch kck kcn kcs kda kdb kdc kdh kdk kds kha khh khk khn khs kkb kkc kkh kkk kkn kks kn- kna knc knd knk knn ksa ksb ksc ksd ksh ksk ksn kss naa nab nac nad nah nak nan nas nba nbb nbc nbd nbk nbn nbs nca ncb ncc ncd nch nck ncn ncs nda ndb ndc ndd ndh ndk ndn nds nha nhb nhc nhd nhh nhk nhn nhs nka nkc nkk nkn nks nna nnb nnc nnh nnk nnn nns nsa nsb nsc nsd nsh nsk nsn nss saa sab sac sad sah sak san sas sba sbb sbc sbd sbh sbk sbn sbs sca scb scc scd sch sck scn scs sda sdb sdc sdd sdh sdk sdn sds sh- sha shb shc shd shh shk shn shs sk- ska skb skc skd skh skk sks sna snb snc snd snk snn sns ss- ssa ssb ssc ssd ssh ssk ssn sss