-er a-a a-b a-c aaa aab aac aad aae aah aar aas ab- aba abb abc abd abe abh abr abs ac- aca acb acc acd ace ach acr acs ad- ada adb adc add ade adh adr ads aea aeb aec aed aee aeh aer aes aha ahb ahc ahd ahe ahh ahr ahs ar- ara arb arc ard are arh arr ars as- asa asb asc asd ase ash asr ass baa bab bac bad bae bah bar bas bba bbb bbc bbd bbe bbh bbr bbs bca bcb bcc bcd bce bch bcr bcs bda bdb bdc bdd bde bdh bdr bds be- bea beb bec bed bee beh ber bes bha bhb bhc bhd bhe bhh bhr bhs bra brb brd bre brh brr brs bsa bsb bsc bsd bse bsh bsr bss c-- caa cab cac cad cae cah car cas cba cbb cbc cbd cbe cbh cbr cbs cca ccb ccc ccd cce cch ccr ccs cda cdb cdc cdd cde cdh cdr cds ce- cea ceb cec ced cee ceh cer ces ch- cha chb chc chd che chh chr chs cra crb crc crd cre crh crr crs csa csb csc csd cse csh csr css daa dab dac dad dae dah dar das dba dbb dbc dbd dbe dbh dbr dbs dca dcb dcc dcd dce dcr dcs dda ddb ddc ddd dde ddh ddr dds de- dea deb dec ded dee deh der des dh- dha dhb dhc dhd dhe dhh dhr dhs dra drb drc drd dre drr drs dsa dsb dsc dsd dse dsh dsr dss eaa eab eac ead eae eah ear eas eba ebb ebc ebd ebe ebh ebr ebs ec- eca ecb ecc ecd ece ech ecr ecs ed- eda edb edc edd ede edh edr eds eea eeb eec eed eee eer ees eha ehb ehc ehd ehe ehh ehr ehs era erb erc erd ere erh err ers es- esa esb esc esd ese esh esr ess haa hab hac had hae hah har has hba hbb hbc hbd hbe hbh hbr hbs hca hcb hcc hcd hce hch hcr hcs hda hdb hdc hdd hde hdh hdr hds he- hea heb hec hed hee heh her hes hha hhb hhc hhd hhe hhh hhr hhs hr- hra hrb hrc hrd hre hrh hrr hrs hsa hsb hsc hsd hse hsh hsr hss ra- raa rab rac rad rae rah rar ras rba rbb rbc rbd rbe rbh 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 rer res rh- rha rhb rhc rhd rhe rhh rhr rhs rra rrb rrc rrd rrh rrr rrs rsa rsb rsc rsd rse rsh rsr rss saa sab sac sad sae sah sar sas sba sbb sbc sbd sbe sbh sbr sbs sca scb scc scd sce sch scr scs sda sdb sdc sdd sde sdh sdr sds se- sea seb sec sed see seh ser ses sh- sha shb shc shd she shh shr shs sr- sra srb src srd sre srh srr srs ss- ssa ssb ssc ssd sse ssh ssr sss