-al -ol a-a a-b aaa aab aad aaf aal aao aar aas ab- aba abb abd abf abl abo abr abs ad- ada adb add adf adl ado adr ads af- afa afb afd aff afl afo afr afs al- ala alb ald alf all alo alr als aoa aob aod aof aol aoo aor aos ar- ara arb ard arf arl aro arr ars as- asa asb asd asf asl aso asr ass baa bab bad baf bal bao bar bas bba bbb bbd bbf bbl bbo bbr bbs bda bdb bdd bdf bdl bdo bdr bds bfa bfb bfd bff bfl bfo bfr bfs bla blb bld blf bll blo blr bls boa bob bod bof bol boo bor bos bra brb brd brf brl bro brr brs bsa bsb bsd bsf bsl bso bsr bss daa dab dad daf dal dao dar das dba dbb dbd dbf dbl dbo dbr dbs dda ddb ddd ddf ddl ddo ddr dds dfa dfb dfd dff dfl dfo dfr dfs dl- dla dlb dld dlf dll dlo dlr dls doa dob dod dof dol doo dor dos dra drb drd drl dro drr drs dsa dsb dsd dsf dsl dso dsr dss faa fab fad faf fal fao far fas fba fbb fbd fbf fbl fbo fbr fbs fda fdb fdd fdf fdl fdo fdr fds ffa ffd fff ffl ffo ffr ffs fla flb fld flf fll flo flr fls foa fob fof fol foo for fos fra frb frd frf frl fro frr frs fsa fsb fsd fsf fsl fso fsr fss la- laa lab lad laf lal lao lar las lba lbb lbd lbf lbl lbo lbr lbs lda ldb ldd ldf ldl ldo ldr lds lfa lfb lfd lff lfl lfo lfr lfs lla llb lld llf lll llo llr lls loa lob lod lof lol loo lor los lra lrb lrd lrf lro lrr lrs lsa lsb lsd lsf lsl lso lsr lss oaa oab oad oaf oal oao oar oas ob- oba obb obd obf obl obo obr obs oda odb odd odf odl odo odr ods of- ofa ofb ofd off ofl ofo ofr ofs ola olb old olf oll olo ols oo- ooa oob ood oof ool ooo oor oos or- ora orb ord orf orl oro orr ors os- osa osb osd osf osl oso osr oss ra- raa rab rad raf ral rao rar ras rba rbb rbd rbf rbl rbo rbr rbs rda rdb rdd rdf rdl rdo rdr rds rfa rfb rfd rff rfl rfo rfr rfs rla rld rlf rll rlo rlr rls roa rob rod rof rol roo ror ros rra rrb rrd rrf rrl rrr rrs rsa rsb rsd rsf rsl rso rsr rss saa sab sad saf sal sao sar sas sba sbb sbd sbf sbl sbo sbr sbs sda sdb sdd sdf sdl sdo sdr sds sfa sfb sfd sff sfl sfo sfr sfs sla slb sld slf sll slo slr sls soa sob sod sof sol soo sor sos sr- sra srb srd srf srl sro srr srs ss- ssa ssb ssd ssf ssl sso ssr sss