-er a-a a-b a-c aaa aab aac aad aae aah aak aar aas ab- aba abb abc abd abe abh abk abr abs ac- aca acb acc acd ace ach ack acr acs ad- ada adb adc add ade adh adk adr ads aea aeb aec aed aee aeh aek aer aes aha ahb ahc ahd ahe ahh ahk ahr ahs aka akb akc akd ake akh akk akr aks ar- ara arb arc ard are arh ark arr ars as- asa asb asc asd ase ash ask asr ass baa bab bac bad bae bah bak bar bas bba bbb bbc bbd bbe bbh bbk bbr bbs bca bcb bcc bcd bce bch bck bcr bcs bda bdb bdc bdd bde bdh bdk bdr bds be- bea beb bec bed bee beh bek ber bes bha bhb bhc bhd bhe bhh bhk bhr bhs bka bkb bkc bke bkk bkr bks bra brb brd bre brh brk brr brs bsa bsb bsc bsd bse bsh bsk bsr bss c-- caa cab cac cad cae cah cak car cas cba cbb cbc cbd cbe cbh cbk cbr cbs cca ccb ccc ccd cce cch cck ccr ccs cda cdb cdc cdd cde cdh cdk cdr cds ce- cea ceb cec ced cee ceh cek cer ces ch- cha chb chc chd che chh chk chr chs cka ckb ckc ckd ckh cks cra crb crc crd cre crh crk crr crs csa csb csc csd cse csh csk csr css daa dab dac dad dae dah dak dar das dba dbb dbc dbd dbe dbh dbk dbr dbs dca dcb dcc dcd dce dck dcr dcs dda ddb ddc ddd dde ddh ddk ddr dds de- dea deb dec ded dee deh dek der des dh- dha dhb dhc dhd dhe dhh dhk dhr dhs dka dkb dkc dke dkk dkr dks dra drb drc drd dre drk drr drs dsa dsb dsc dsd dse dsh dsk dsr dss eaa eab eac ead eae eah eak ear eas eba ebb ebc ebd ebe ebh ebk ebr ebs ec- eca ecb ecc ecd ece ech eck ecr ecs ed- eda edb edc edd ede edh edk edr eds eea eeb eec eed eee eek eer ees eha ehb ehc ehd ehe ehh ehr ehs eka ekb ekc ekd eke ekh ekr eks era erb erc erd ere erh erk err ers es- esa esb esc esd ese esh esk esr ess haa hab hac had hae hah hak har has hba hbb hbc hbd hbe hbh hbk hbr hbs hca hcb hcc hcd hce hch hck hcr hcs hda hdb hdc hdd hde hdh hdk hdr hds he- hea heb hec hed hee heh hek her hes hha hhb hhc hhd hhe hhh hhk hhr hhs hka hkb hkd hkh hkk hkr hks hr- hra hrb hrc hrd hre hrh hrk hrr hrs hsa hsb hsc hsd hse hsh hsk hsr hss ka- kaa kab kac kad kae kah kak kar kas kba kbb kbc kbd kbe kbh kbk kbr kbs kca kcb kcc kcd kce kch kck kcr kcs kda kdb kdc kde kdh kdk kdr kds ke- kea keb kec ked kee keh kek ker kes kha khe khh khk khr khs kkb kkc kke kkh kkk kkr kks kra krc krd krk krr krs ksa ksb ksc ksd kse ksh ksk ksr kss ra- raa rab rac rad rae rah rak rar ras rba rbb rbc rbd rbe rbh rbk rbr rbs rca rcb rcc rcd rce rch rcr rcs rda rdb rdc rdd rde rdh rdr rds re- rea reb rec red ree reh rek rer res rh- rha rhb rhc rhd rhe rhh rhr rhs rkb rkc rke rkk rks rra rrb rrc rrd rrh rrk rrr rrs rsa rsb rsc rsd rse rsh rsk rsr rss saa sab sac sad sae sah sak sar sas sba sbb sbc sbd sbe sbh sbk sbr sbs sca scb scc scd sce sch sck scr scs sda sdb sdc sdd sde sdh sdk sdr sds se- sea seb sec sed see seh sek ser ses sh- sha shb shc shd she shh shk shr shs sk- ska skb skc skd ske skh skk skr sks sr- sra srb src srd sre srh srk srr srs ss- ssa ssb ssc ssd sse ssh ssk ssr sss