-al -ol a-a a-b aaa aab aad aaf aah aal aao aar aas ab- aba abb abd abf abh abl abo abr abs ad- ada adb add adf adh adl ado adr ads af- afa afb afd aff afh afl afo afr afs aha ahb ahd ahf ahh ahl aho ahr ahs al- ala alb ald alf alh all alo alr als aoa aob aod aof aoh aol aoo aor aos ar- ara arb ard arf arh arl aro arr ars as- asa asb asd asf ash asl aso asr ass baa bab bad baf bah bal bao bar bas bba bbb bbd bbf bbh bbl bbo bbr bbs bda bdb bdd bdf bdh bdl bdo bdr bds bfa bfb bfd bff bfh bfl bfo bfr bfs bha bhb bhd bhf bhh bhl bho bhr bhs bla blb bld blf blh bll blo blr bls boa bob bod bof boh bol boo bor bos bra brb brd brf brh brl bro brr brs bsa bsb bsd bsf bsh bsl bso bsr bss daa dab dad daf dah dal dao dar das dba dbb dbd dbf dbh dbl dbo dbr dbs dda ddb ddd ddf ddh ddl ddo ddr dds dfa dfb dfd dff dfh dfl dfo dfr dfs dh- dha dhb dhd dhf dhh dhl dho dhr dhs dl- dla dlb dld dlf dlh dll dlo dlr dls doa dob dod dof doh dol doo dor dos dra drb drd drl dro drr drs dsa dsb dsd dsf dsh dsl dso dsr dss faa fab fad faf fah fal fao far fas fba fbb fbd fbf fbh fbl fbo fbr fbs fda fdb fdd fdf fdh fdl fdo fdr fds ffa ffd fff ffh ffl ffo ffr ffs fha fhb fhf fhh fhl fho fhr fhs fla flb fld flf fll flo flr fls foa fob fof foh fol foo for fos fra frb frd frf frh frl fro frr frs fsa fsb fsd fsf fsh fsl fso fsr fss haa hab had haf hah hal hao har has hba hbb hbd hbf hbh hbl hbo hbr hbs hda hdb hdd hdf hdh hdl hdo hdr hds hfa hfb hfd hff hfh hfl hfo hfr hfs hha hhb hhd hhf hhh hhl hho hhr hhs hla hlb hld hlf hlh hll hlo hlr hls hoa hob hod hof hoh hol hoo hor hos hr- hra hrb hrd hrf hrh hrl hro hrr hrs hsa hsb hsd hsf hsh hsl hsr hss la- laa lab lad laf lah lal lao lar las lba lbb lbd lbf lbh lbl lbo lbr lbs lda ldb ldd ldf ldh ldl ldo ldr lds lfa lfb lfd lff lfh lfl lfo lfr lfs lha lhb lhd lhf lhh lho lhr lhs lla llb lld llf lll llo llr lls loa lob lod lof loh lol loo lor los lra lrb lrd lrf lrh lro lrr lrs lsa lsb lsd lsf lsh lsl lso lsr lss oaa oab oad oaf oah oal oao oar oas ob- oba obb obd obf obh obl obo obr obs oda odb odd odf odh odl odo odr ods of- ofa ofb ofd off ofl ofo ofr ofs oha ohd ohf ohh ohl oho ohr ohs ola olb old olf oll olo ols oo- ooa oob ood oof ooh ool ooo oor oos or- ora orb ord orf orh orl oro orr ors os- osa osb osd osf osh osl oso osr oss ra- raa rab rad raf rah ral rao rar ras rba rbb rbd rbf rbh rbl rbo rbr rbs rda rdb rdd rdf rdh rdl rdo rdr rds rfa rfb rfd rff rfh rfl rfo rfr rfs rh- rha rhb rhd rhf rhh rhl rho rhr rhs rla rld rlf rlh rll rlo rlr rls roa rob rod rof roh rol roo ror ros rra rrb rrd rrf rrh rrl rrr rrs rsa rsb rsd rsf rsh rsl rso rsr rss saa sab sad saf sah sal sao sar sas sba sbb sbd sbf sbh sbl sbo sbr sbs sda sdb sdd sdf sdh sdl sdo sdr sds sfa sfb sfd sff sfh sfl sfo sfr sfs sh- sha shb shd shf shh shl sho shr shs sla slb sld slf slh sll slo slr sls soa sob sod sof soh sol soo sor sos sr- sra srb srd srf srh srl sro srr srs ss- ssa ssb ssd ssf ssh ssl sso ssr sss