-al a-a a-b a-t aaa aab aad aal aar aas aat ab- aba abb abd abl abr abs abt ad- ada adb add adl adr ads adt al- ala alb ald all alr als alt ar- ara arb ard arl arr ars art as- asa asb asd asl asr ass ast at- ata atb atd atl atr ats att baa bab bad bal bar bas bat bba bbb bbd bbl bbr bbs bbt bda bdb bdd bdl bdr bds bdt bla blb bld bll blr bls blt bra brb brd brl brr brs brt bsa bsb bsd bsl bsr bss bst bta btb btd btl btr bts btt daa dab dad dal dar das dat dba dbb dbd dbl dbr dbs dbt dda ddb ddd ddl ddr dds ddt dl- dla dlb dld dll dlr dls dlt dra drb drd drl drr drs drt dsa dsb dsd dsl dsr dss dst dta dtb dtd dtl dtr dts dtt la- laa lab lad lal lar las lat lba lbb lbd lbl lbr lbs lbt lda ldb ldd ldl ldr lds ldt lla llb lld lll llr lls llt lra lrb lrd lrr lrs lrt lsa lsb lsd lsl lsr lss lst lta ltb ltd ltl ltr lts ltt ra- raa rab rad ral rar ras rat rba rbb rbd rbl rbr rbs rbt rda rdb rdd rdl rdr rds rdt rla rld rll rlr rls rlt rra rrb rrd rrl rrr rrs rrt rsa rsb rsd rsl rsr rss rst rta rtb rtd rtl rtr rts rtt saa sab sad sal sar sas sat sba sbb sbd sbl sbr sbs sbt sda sdb sdd sdl sdr sds sdt sla slb sld sll slr sls slt sr- sra srb srd srl srr srs srt ss- ssa ssb ssd ssl ssr sss sst sta stb std stl str sts stt taa tab tad tal tar tas tat tba tbb tbd tbl tbr tbs tbt tda tdb tdd tdl tdr tds tdt tla tld tll tlr tls tlt tra trb trd trl trr trs trt tsa tsb tsd tsl tsr tss tst tta ttb ttd ttl ttr tts ttt