a-a a-b aaa aab aad aaf aah aar aas ab- aba abb abd abf abh abr abs ad- ada adb add adf adh adr ads af- afa afb afd aff afh afr afs aha ahb ahd ahf ahh ahr ahs ar- ara arb ard arf arh arr ars as- asa asb asd asf ash asr ass baa bab bad baf bah bar bas bba bbb bbd bbf bbh bbr bbs bda bdb bdd bdf bdh bdr bds bfa bfb bfd bff bfh bfr bfs bha bhb bhd bhf bhh bhr bhs bra brb brd brf brh brr brs bsa bsb bsd bsf bsh bsr bss daa dab dad daf dah dar das dba dbb dbd dbf dbh dbr dbs dda ddb ddd ddf ddh ddr dds dfa dfb dfd dff dfh dfr dfs dh- dha dhb dhd dhf dhh dhr dhs dra drb drd drr drs dsa dsb dsd dsf dsh dsr dss faa fab fad faf fah far fas fba fbb fbd fbf fbh fbr fbs fda fdb fdd fdf fdh fdr fds ffa ffd fff ffh ffr ffs fha fhb fhf fhh fhr fhs fra frb frd frf frh frr frs fsa fsb fsd fsf fsh fsr fss haa hab had haf hah har has hba hbb hbd hbf hbh hbr hbs hda hdb hdd hdf hdh hdr hds hfa hfb hfd hff hfh hfr hfs hha hhb hhd hhf hhh hhr hhs hr- hra hrb hrd hrf hrh hrr hrs hsa hsb hsd hsf hsh hsr hss ra- raa rab rad raf rah rar ras rba rbb rbd rbf rbh rbr rbs rda rdb rdd rdf rdh rdr rds rfa rfb rfd rff rfh rfr rfs rh- rha rhb rhd rhf rhh rhr rhs rra rrb rrd rrf rrh rrr rrs rsa rsb rsd rsf rsh rsr rss saa sab sad saf sah sar sas sba sbb sbd sbf sbh sbr sbs sda sdb sdd sdf sdh sdr sds sfa sfb sfd sff sfh sfr sfs sh- sha shb shd shf shh shr shs sr- sra srb srd srf srh srr srs ss- ssa ssb ssd ssf ssh ssr sss