-al a-a a-b a-t aaa aab aad aal aas aat ab- aba abb abd abl abs abt ad- ada adb add adl ads adt al- ala alb ald all als alt as- asa asb asd asl ass ast at- ata atb atd atl ats att baa bab bad bal bas bat bba bbb bbd bbl bbs bbt bda bdb bdd bdl bds bdt bla blb bld bll bls blt bsa bsb bsd bsl bss bst bta btb btd btl bts btt daa dab dad dal das dat dba dbb dbd dbl dbs dbt dda ddb ddd ddl dds ddt dl- dla dlb dld dll dls dlt dsa dsb dsd dsl dss dst dta dtb dtd dtl dts dtt la- laa lab lad lal las lat lba lbb lbd lbl lbs lbt lda ldb ldd ldl lds ldt lla llb lld lll lls llt lsa lsb lsd lsl lss lst lta ltb ltd ltl lts ltt saa sab sad sal sas sat sba sbb sbd sbl sbs sbt sda sdb sdd sdl sds sdt sla slb sld sll sls slt ss- ssa ssb ssd ssl sss sst sta stb std stl sts stt taa tab tad tal tas tat tba tbb tbd tbl tbs tbt tda tdb tdd tdl tds tdt tla tld tll tls tlt tsa tsb tsd tsl tss tst tta ttb ttd ttl tts ttt