-al -ol a-a a-b a-t aaa aab aad aaf aal aao aas aat ab- aba abb abd abf abl abo abs abt ad- ada adb add adf adl ado ads adt af- afa afb afd aff afl afo afs aft al- ala alb ald alf all alo als alt aoa aob aod aof aol aoo aos aot as- asa asb asd asf asl aso ass ast at- ata atb atd atf atl ato ats att baa bab bad baf bal bao bas bat bba bbb bbd bbf bbl bbo bbs bbt bda bdb bdd bdf bdl bdo bds bdt bfa bfb bfd bff bfl bfo bfs bft bla blb bld blf bll blo bls blt boa bob bod bof bol boo bos bot bsa bsb bsd bsf bsl bso bss bst bta btb btd btf btl bto bts btt daa dab dad daf dal dao das dat dba dbb dbd dbf dbl dbo dbs dbt dda ddb ddd ddf ddl ddo dds ddt dfa dfb dfd dff dfl dfo dfs dft dl- dla dlb dld dlf dll dlo dls dlt doa dob dod dof dol doo dos dot dsa dsb dsd dsf dsl dso dss dst dta dtb dtd dtf dtl dto dts dtt faa fab fad faf fal fao fas fat fba fbb fbd fbf fbl fbo fbs fbt fda fdb fdd fdf fdl fdo fds fdt ffa ffd fff ffl ffo ffs fft fla flb fld flf fll flo fls flt foa fob fof fol foo fos fot fsa fsb fsd fsf fsl fso fss fst fta ftb ftd ftf ftl fto fts ftt la- laa lab lad laf lal lao las lat lba lbb lbd lbf lbl lbo lbs lbt lda ldb ldd ldf ldl ldo lds ldt lfa lfb lfd lff lfl lfo lfs lft lla llb lld llf lll llo lls llt loa lob lod lof lol loo los lot lsa lsb lsd lsf lsl lso lss lst lta ltb ltd ltf ltl lto lts ltt oaa oab oad oaf oal oao oas oat ob- oba obb obd obf obl obo obs obt oda odb odd odf odl odo ods odt of- ofa ofb ofd off ofl ofo ofs oft ola olb old olf oll olo ols olt oo- ooa oob ood oof ool ooo oos oot os- osa osb osd osf osl oso oss ost ot- ota otb otd otf otl oto ots ott saa sab sad saf sal sao sas sat sba sbb sbd sbf sbl sbo sbs sbt sda sdb sdd sdf sdl sdo sds sdt sfa sfb sfd sff sfl sfo sfs sft sla slb sld slf sll slo sls slt soa sob sod sof sol soo sos sot ss- ssa ssb ssd ssf ssl sso sss sst sta stb std stf stl sto sts stt taa tab tad taf tal tao tas tat tba tbb tbd tbf tbl tbo tbs tbt tda tdb tdd tdf tdl tdo tds tdt tfa tfb tfd tff tfl tfo tfs tft tla tld tlf tll tlo tls tlt to- toa tob tod tof tol too tos tot tsa tsb tsd tsf tsl tso tss tst tta ttb ttd ttf ttl tto tts ttt