a-a a-b a-c aaa aab aac aad aae aah aao aas ab- aba abb abc abd abe abh abo abs ac- aca acb acc acd ace ach aco acs ad- ada adb adc add ade adh ado ads aea aeb aec aed aee aeh aeo aes aha ahb ahc ahd ahe ahh aho ahs aoa aob aoc aod aoe aoh aoo aos as- asa asb asc asd ase ash aso ass baa bab bac bad bae bah bao bas bba bbb bbc bbd bbe bbh bbo bbs bca bcb bcc bcd bce bch bco bcs bda bdb bdc bdd bde bdh bdo bds be- bea beb bec bed bee beh beo bes bha bhb bhc bhd bhe bhh bho bhs boa bob boc bod boe boh boo bos bsa bsb bsc bsd bse bsh bso bss c-- caa cab cac cad cae cah cao cas cba cbb cbc cbd cbe cbh cbo cbs cca ccb ccc ccd cce cch cco ccs cda cdb cdc cdd cde cdh cdo cds ce- cea ceb cec ced cee ceh ceo ces ch- cha chb chc chd che chh cho chs co- coa cob coc cod coe coh coo cos csa csb csc csd cse csh cso css daa dab dac dad dae dah dao das dba dbb dbc dbd dbe dbh dbo dbs dca dcb dcc dcd dce dco dcs dda ddb ddc ddd dde ddh ddo dds de- dea deb dec ded dee deh deo des dh- dha dhb dhc dhd dhe dhh dho dhs doa dob doc dod doe doh doo dos dsa dsb dsc dsd dse dsh dso dss eaa eab eac ead eae eah eao eas eba ebb ebc ebd ebe ebh ebo ebs ec- eca ecb ecc ecd ece ech eco ecs ed- eda edb edc edd ede edh edo eds eea eeb eec eed eee eeo ees eha ehb ehc ehd ehe ehh eho ehs eo- eoa eob eoc eod eoe eoh eoo eos es- esa esb esc esd ese esh eso ess haa hab hac had hae hah hao has hba hbb hbc hbd hbe hbh hbo hbs hca hcb hcc hcd hce hch hco hcs hda hdb hdc hdd hde hdh hdo hds he- hea heb hec hed hee heh heo hes hha hhb hhc hhd hhe hhh hho hhs hoa hob hoc hod hoe hoh hoo hos hsa hsb hsc hsd hse hsh hss oaa oab oac oad oae oah oao oas ob- oba obb obc obd obe obh obo obs oc- oca ocb occ ocd och oco ocs oda odb odc odd ode odh odo ods oea oeb oec oed oee oeh oeo oes oha ohc ohd ohe ohh oho ohs oo- ooa oob ooc ood ooh ooo oos os- osa osb osc osd ose osh oso oss saa sab sac sad sae sah sao sas sba sbb sbc sbd sbe sbh sbo sbs sca scb scc scd sce sch sco scs sda sdb sdc sdd sde sdh sdo sds se- sea seb sec sed see seh seo ses sh- sha shb shc shd she shh sho shs soa sob soc sod soe soh soo sos ss- ssa ssb ssc ssd sse ssh sso sss