a-a a-b a-c aaa aab aac aad aah aao aar aas ab- aba abb abc abd abh abo abr abs ac- aca acb acc acd ach aco acr acs ad- ada adb adc add adh ado adr ads aha ahb ahc ahd ahh aho ahr ahs aoa aob aoc aod aoh aoo aor aos ar- ara arb arc ard arh aro arr ars as- asa asb asc asd ash aso asr ass baa bab bac bad bah bao bar bas bba bbb bbc bbd bbh bbo bbr bbs bca bcb bcc bcd bch bco bcr bcs bda bdb bdc bdd bdh bdo bdr bds bha bhb bhc bhd bhh bho bhr bhs boa bob boc bod boh boo bor bos bra brb brd brh bro brr brs bsa bsb bsc bsd bsh bso bsr bss c-- caa cab cac cad cah cao car cas cba cbb cbc cbd cbh cbo cbr cbs cca ccb ccc ccd cch cco ccr ccs cda cdb cdc cdd cdh cdo cdr cds ch- cha chb chc chd chh cho chr chs co- coa cob coc cod coh coo cor cos cra crb crc crd crh cro crr crs csa csb csc csd csh cso csr css daa dab dac dad dah dao dar das dba dbb dbc dbd dbh dbo dbr dbs dca dcb dcc dcd dco dcr dcs dda ddb ddc ddd ddh ddo ddr dds dh- dha dhb dhc dhd dhh dho dhr dhs doa dob doc dod doh doo dor dos dra drb drc drd dro drr drs dsa dsb dsc dsd dsh dso dsr dss haa hab hac had hah hao har has hba hbb hbc hbd hbh hbo hbr hbs hca hcb hcc hcd hch hco hcr hcs hda hdb hdc hdd hdh hdo hdr hds hha hhb hhc hhd hhh hho hhr hhs hoa hob hoc hod hoh hoo hor hos hr- hra hrb hrc hrd hrh hro hrr hrs hsa hsb hsc hsd hsh hsr hss oaa oab oac oad oah oao oar oas ob- oba obb obc obd obh obo obr obs oc- oca ocb occ ocd och oco ocr ocs oda odb odc odd odh odo odr ods oha ohc ohd ohh oho ohr ohs oo- ooa oob ooc ood ooh ooo oor oos or- ora orb orc ord orh oro orr ors os- osa osb osc osd osh oso osr oss ra- raa rab rac rad rah rao rar ras rba rbb rbc rbd rbh rbo rbr rbs rca rcb rcc rcd rch rco rcr rcs rda rdb rdc rdd rdh rdo rdr rds rh- rha rhb rhc rhd rhh rho rhr rhs roa rob roc rod roh roo ror ros rra rrb rrc rrd rrh rrr rrs rsa rsb rsc rsd rsh rso rsr rss saa sab sac sad sah sao sar sas sba sbb sbc sbd sbh sbo sbr sbs sca scb scc scd sch sco scr scs sda sdb sdc sdd sdh sdo sdr sds sh- sha shb shc shd shh sho shr shs soa sob soc sod soh soo sor sos sr- sra srb src srd srh sro srr srs ss- ssa ssb ssc ssd ssh sso ssr sss