a-a a-b a-c aaa aab aac aad aah aak aas aau ab- aba abb abc abd abh abk abs abu ac- aca acb acc acd ach ack acs acu ad- ada adb adc add adh adk ads adu aha ahb ahc ahd ahh ahk ahs ahu aka akb akc akd akh akk aks aku as- asa asb asc asd ash ask ass asu au- aua aub auc aud auh auk aus b-u baa bab bac bad bah bak bas bau bba bbb bbc bbd bbh bbk bbs bbu bca bcb bcc bcd bch bck bcs bcu bda bdb bdc bdd bdh bdk bds bdu bha bhb bhc bhd bhh bhk bhs bhu bka bkb bkc bkk bks bsa bsb bsc bsd bsh bsk bss bsu bua bub buc bud buh buk bus buu c-- caa cab cac cad cah cak cas cau cba cbb cbc cbd cbh cbk cbs cbu cca ccb ccc ccd cch cck ccs ccu cda cdb cdc cdd cdh cdk cds cdu ch- cha chb chc chd chh chk chs chu cka ckb ckc ckd ckh cks csa csb csc csd csh csk css csu cua cub cuc cud cuh cuk cus cuu daa dab dac dad dah dak das dau dba dbb dbc dbd dbh dbk dbs dbu dca dcb dcc dcd dck dcs dcu dda ddb ddc ddd ddh ddk dds ddu dh- dha dhb dhc dhd dhh dhk dhs dhu dka dkb dkc dkk dks dku dsa dsb dsc dsd dsh dsk dss dsu dua dub duc dud duh duk dus haa hab hac had hah hak has hau hba hbb hbc hbd hbh hbk hbs hbu hca hcb hcc hcd hch hck hcs hda hdb hdc hdd hdh hdk hds hdu hha hhb hhc hhd hhh hhk hhs hhu hka hkb hkd hkh hkk hks hku hsa hsb hsc hsd hsh hsk hss hsu hua hub huc hud huh huk hus huu ka- kaa kab kac kad kah kak kas kau kba kbb kbc kbd kbh kbk kbs kbu kca kcb kcc kcd kch kck kcs kcu kda kdb kdc kdh kdk kds kdu kha khh khk khs khu kkb kkc kkh kkk kks kku ksa ksb ksc ksd ksh ksk kss ksu kub kuc kud kuh kuk kus kuu saa sab sac sad sah sak sas sau sba sbb sbc sbd sbh sbk sbs sbu sca scb scc scd sch sck scs scu sda sdb sdc sdd sdh sdk sds sdu sh- sha shb shc shd shh shk shs shu sk- ska skb skc skd skh skk sks sku ss- ssa ssb ssc ssd ssh ssk sss ssu sua sub suc sud suh suk sus suu ua- uaa uab uac uad uah uak uas uau uba ubb ubc ubh ubk ubs ubu uca ucb ucc ucd uch uck ucs ucu uda udb udc udd udk uds udu uha uhb uhc uhd uhh uhs uhu uka ukb ukc ukk uku usa usb usc usd ush usk uss usu uua uuc uus uuu