-al -ol a-a a-b a-t aaa aab aad aal aao aas aat ab- aba abb abd abl abo abs abt ad- ada adb add adl ado ads adt al- ala alb ald all alo als alt aoa aob aod aol aoo aos aot as- asa asb asd asl aso ass ast at- ata atb atd atl ato ats att baa bab bad bal bao bas bat bba bbb bbd bbl bbo bbs bbt bda bdb bdd bdl bdo bds bdt bla blb bld bll blo bls blt boa bob bod bol boo bos bot bsa bsb bsd bsl bso bss bst bta btb btd btl bto bts btt daa dab dad dal dao das dat dba dbb dbd dbl dbo dbs dbt dda ddb ddd ddl ddo dds ddt dl- dla dlb dld dll dlo dls dlt doa dob dod dol doo dos dot dsa dsb dsd dsl dso dss dst dta dtb dtd dtl dto dts dtt la- laa lab lad lal lao las lat lba lbb lbd lbl lbo lbs lbt lda ldb ldd ldl ldo lds ldt lla llb lld lll llo lls llt loa lob lod lol loo los lot lsa lsb lsd lsl lso lss lst lta ltb ltd ltl lto lts ltt oaa oab oad oal oao oas oat ob- oba obb obd obl obo obs obt oda odb odd odl odo ods odt ola olb old oll olo ols olt oo- ooa oob ood ool ooo oos oot os- osa osb osd osl oso oss ost ot- ota otb otd otl oto ots ott saa sab sad sal sao sas sat sba sbb sbd sbl sbo sbs sbt sda sdb sdd sdl sdo sds sdt sla slb sld sll slo sls slt soa sob sod sol soo sos sot ss- ssa ssb ssd ssl sso sss sst sta stb std stl sto sts stt taa tab tad tal tao tas tat tba tbb tbd tbl tbo tbs tbt tda tdb tdd tdl tdo tds tdt tla tld tll tlo tls tlt to- toa tob tod tol too tos tot tsa tsb tsd tsl tso tss tst tta ttb ttd ttl tto tts ttt