-al -ol a-a a-b a-t aaa aab aad aaf aal aao aar aas aat ab- aba abb abd abf abl abo abr abs abt ad- ada adb add adf adl ado adr ads adt af- afa afb afd aff afl afo afr afs aft al- ala alb ald alf all alo alr als alt aoa aob aod aof aol aoo aor aos aot ar- ara arb ard arf arl aro arr ars art as- asa asb asd asf asl aso asr ass ast at- ata atb atd atf atl ato atr ats att baa bab bad baf bal bao bar bas bat bba bbb bbd bbf bbl bbo bbr bbs bbt bda bdb bdd bdf bdl bdo bdr bds bdt bfa bfb bfd bff bfl bfo bfr bfs bft bla blb bld blf bll blo blr bls blt boa bob bod bof bol boo bor bos bot bra brb brd brf brl bro brr brs brt bsa bsb bsd bsf bsl bso bsr bss bst bta btb btd btf btl bto btr bts btt daa dab dad daf dal dao dar das dat dba dbb dbd dbf dbl dbo dbr dbs dbt dda ddb ddd ddf ddl ddo ddr dds ddt dfa dfb dfd dff dfl dfo dfr dfs dft dl- dla dlb dld dlf dll dlo dlr dls dlt doa dob dod dof dol doo dor dos dot dra drb drd drl dro drr drs drt dsa dsb dsd dsf dsl dso dsr dss dst dta dtb dtd dtf dtl dto dtr dts dtt faa fab fad faf fal fao far fas fat fba fbb fbd fbf fbl fbo fbr fbs fbt fda fdb fdd fdf fdl fdo fdr fds fdt ffa ffd fff ffl ffo ffr ffs fft fla flb fld flf fll flo flr fls flt foa fob fof fol foo for fos fot fra frb frd frf frl fro frr frs frt fsa fsb fsd fsf fsl fso fsr fss fst fta ftb ftd ftf ftl fto ftr fts ftt la- laa lab lad laf lal lao lar las lat lba lbb lbd lbf lbl lbo lbr lbs lbt lda ldb ldd ldf ldl ldo ldr lds ldt lfa lfb lfd lff lfl lfo lfr lfs lft lla llb lld llf lll llo llr lls llt loa lob lod lof lol loo lor los lot lra lrb lrd lrf lro lrr lrs lrt lsa lsb lsd lsf lsl lso lsr lss lst lta ltb ltd ltf ltl lto ltr lts ltt oaa oab oad oaf oal oao oar oas oat ob- oba obb obd obf obl obo obr obs obt oda odb odd odf odl odo odr ods odt of- ofa ofb ofd off ofl ofo ofr ofs oft ola olb old olf oll olo ols olt oo- ooa oob ood oof ool ooo oor oos oot or- ora orb ord orf orl oro orr ors ort os- osa osb osd osf osl oso osr oss ost ot- ota otb otd otf otl oto otr ots ott ra- raa rab rad raf ral rao rar ras rat rba rbb rbd rbf rbl rbo rbr rbs rbt rda rdb rdd rdf rdl rdo rdr rds rdt rfa rfb rfd rff rfl rfo rfr rfs rft rla rld rlf rll rlo rlr rls rlt roa rob rod rof rol roo ror ros rot rra rrb rrd rrf rrl rrr rrs rrt rsa rsb rsd rsf rsl rso rsr rss rst rta rtb rtd rtf rtl rto rtr rts rtt saa sab sad saf sal sao sar sas sat sba sbb sbd sbf sbl sbo sbr sbs sbt sda sdb sdd sdf sdl sdo sdr sds sdt sfa sfb sfd sff sfl sfo sfr sfs sft sla slb sld slf sll slo slr sls slt soa sob sod sof sol soo sor sos sot sr- sra srb srd srf srl sro srr srs srt ss- ssa ssb ssd ssf ssl sso ssr sss sst sta stb std stf stl sto str sts stt taa tab tad taf tal tao tar tas tat tba tbb tbd tbf tbl tbo tbr tbs tbt tda tdb tdd tdf tdl tdo tdr tds tdt tfa tfb tfd tff tfl tfo tfr tfs tft tla tld tlf tll tlo tlr tls tlt to- toa tob tod tof tol too tor tos tot tra trb trd trf trl tro trr trs trt tsa tsb tsd tsf tsl tso tsr tss tst tta ttb ttd ttf ttl tto ttr tts ttt