-al -ol a-a a-b a-t aaa aab aad aak aal aao aar aas aat ab- aba abb abd abk abl abo abr abs abt ad- ada adb add adk adl ado adr ads adt aka akb akd akk akl ako akr aks al- ala alb ald alk all alo alr als alt aoa aob aod aok aol aoo aor aos aot ar- ara arb ard ark arl aro arr ars art as- asa asb asd ask asl aso asr ass ast at- ata atb atd atl ato atr ats att baa bab bad bak bal bao bar bas bat bba bbb bbd bbk bbl bbo bbr bbs bbt bda bdb bdd bdk bdl bdo bdr bds bdt bka bkb bkk bkl bko bkr bks bkt bla blb bld blk bll blo blr bls blt boa bob bod bok bol boo bor bos bot bra brb brd brk brl bro brr brs brt bsa bsb bsd bsk bsl bso bsr bss bst bta btb btd btk btl bto btr bts btt daa dab dad dak dal dao dar das dat dba dbb dbd dbk dbl dbo dbr dbs dbt dda ddb ddd ddk ddl ddo ddr dds ddt dka dkb dkk dkl dko dkr dks dkt dl- dla dlb dld dlk dll dlo dlr dls dlt doa dob dod dok dol doo dor dos dot dra drb drd drk drl dro drr drs drt dsa dsb dsd dsk dsl dso dsr dss dst dta dtb dtd dtk dtl dto dtr dts dtt k-t ka- kaa kab kad kak kal kao kar kas kat kba kbb kbd kbk kbl kbo kbr kbs kda kdb kdk kdl kdo kdr kds kdt kkb kkk kkl kkr kks kkt kl- kla klb kld klo klr kls klt koa kob kod kok kol koo kor kos kot kra krd krk krl kro krr krs krt ksa ksb ksd ksk ksl kso ksr kss kst kta ktb ktk ktl kto ktr kts ktt la- laa lab lad lak lal lao lar las lat lba lbb lbd lbk lbl lbo lbr lbs lbt lda ldb ldd ldk ldl ldo ldr lds ldt lka lkb lkl lkr lks lkt lla llb lld llk lll llo llr lls llt loa lob lod lok lol loo lor los lot lra lrb lrd lrk lro lrr lrs lrt lsa lsb lsd lsk lsl lso lsr lss lst lta ltb ltd ltk ltl lto ltr lts ltt oaa oab oad oak oal oao oar oas oat ob- oba obb obd obk obl obo obr obs obt oda odb odd odl odo odr ods odt oka okb okd okk okl oko okr oks ola olb old olk oll olo ols olt oo- ooa oob ood ook ool ooo oor oos oot or- ora orb ord ork orl oro orr ors ort os- osa osb osd osk osl oso osr oss ost ot- ota otb otd otk otl oto otr ots ott ra- raa rab rad rak ral rao rar ras rat rba rbb rbd rbk rbl rbo rbr rbs rbt rda rdb rdd rdl rdo rdr rds rdt rkb rkk rko rks rkt rla rld rll rlo rlr rls rlt roa rob rod rok rol roo ror ros rot rra rrb rrd rrk rrl rrr rrs rrt rsa rsb rsd rsk rsl rso rsr rss rst rta rtb rtd rtk rtl rto rtr rts rtt saa sab sad sak sal sao sar sas sat sba sbb sbd sbk sbl sbo sbr sbs sbt sda sdb sdd sdk sdl sdo sdr sds sdt sk- ska skb skd skk skl sko skr sks skt sla slb sld slk sll slo slr sls slt soa sob sod sok sol soo sor sos sot sr- sra srb srd srk srl sro srr srs srt ss- ssa ssb ssd ssk ssl sso ssr sss sst sta stb std stk stl sto str sts stt taa tab tad tak tal tao tar tas tat tba tbb tbd tbk tbl tbo tbr tbs tbt tda tdb tdd tdk tdl tdo tdr tds tdt tka tkb tkk tkl tko tkr tks tkt tla tld tlk tll tlo tlr tls tlt to- toa tob tod tok tol too tor tos tot tra trb trd trk trl tro trr trs trt tsa tsb tsd tsk tsl tso tsr tss tst tta ttb ttd ttk ttl tto ttr tts ttt