-er a-a a-b a-t aaa aab aad aae aak aao aar aas aat ab- aba abb abd abe abk abo abr abs abt ad- ada adb add ade adk ado adr ads adt aea aeb aed aee aek aeo aer aes aet aka akb akd ake akk ako akr aks aoa aob aod aoe aok aoo aor aos aot ar- ara arb ard are ark aro arr ars art as- asa asb asd ase ask aso asr ass ast at- ata atb atd ate ato atr ats att baa bab bad bae bak bao bar bas bat bba bbb bbd bbe bbk bbo bbr bbs bbt bda bdb bdd bde bdk bdo bdr bds bdt be- bea beb bed bee bek beo ber bes bet bka bkb bke bkk bko bkr bks bkt boa bob bod boe bok boo bor bos bot bra brb brd bre brk bro brr brs brt bsa bsb bsd bse bsk bso bsr bss bst bta btb btd bte btk bto btr bts btt daa dab dad dae dak dao dar das dat dba dbb dbd dbe dbk dbo dbr dbs dbt dda ddb ddd dde ddk ddo ddr dds ddt de- dea deb ded dee dek deo der des det dka dkb dke dkk dko dkr dks dkt doa dob dod doe dok doo dor dos dot dra drb drd dre drk dro drr drs drt dsa dsb dsd dse dsk dso dsr dss dst dta dtb dtd dte dtk dto dtr dts dtt eaa eab ead eae eak eao ear eas eat eba ebb ebd ebe ebk ebo ebr ebs ebt ed- eda edb edd ede edk edo edr eds edt eea eeb eed eee eek eeo eer ees eet eka ekb ekd eke eko ekr eks ekt eo- eoa eob eod eoe eok eoo eor eos eot era erb erd ere erk ero err ers ert es- esa esb esd ese esk eso esr ess est eta etb etd ete etk eto etr ets ett k-t ka- kaa kab kad kae kak kao kar kas kat kba kbb kbd kbe kbk kbo kbr kbs kda kdb kde kdk kdo kdr kds kdt ke- kea keb ked kee kek keo ker kes ket kkb kke kkk kkr kks kkt koa kob kod koe kok koo kor kos kot kra krd krk kro krr krs krt ksa ksb ksd kse ksk kso ksr kss kst kta ktb kte ktk kto ktr kts ktt oaa oab oad oae oak oao oar oas oat ob- oba obb obd obe obk obo obr obs obt oda odb odd ode odo odr ods odt oea oeb oed oee oeo oer oes oet oka okb okd oke okk oko okr oks oo- ooa oob ood ook ooo oor oos oot or- ora orb ord ore ork oro orr ors ort os- osa osb osd ose osk oso osr oss ost ot- ota otb otd ote otk oto otr ots ott ra- raa rab rad rae rak rao rar ras rat rba rbb rbd rbe rbk rbo rbr rbs rbt rda rdb rdd rde rdo rdr rds rdt re- rea reb red ree rek reo rer res ret rkb rke rkk rko rks rkt roa rob rod roe rok roo ror ros rot rra rrb rrd rrk rrr rrs rrt rsa rsb rsd rse rsk rso rsr rss rst rta rtb rtd rte rtk rto rtr rts rtt saa sab sad sae sak sao sar sas sat sba sbb sbd sbe sbk sbo sbr sbs sbt sda sdb sdd sde sdk sdo sdr sds sdt se- sea seb sed see sek seo ser ses set sk- ska skb skd ske skk sko skr sks skt soa sob sod soe sok soo sor sos sot sr- sra srb srd sre srk sro srr srs srt ss- ssa ssb ssd sse ssk sso ssr sss sst sta stb std ste stk sto str sts stt taa tab tad tae tak tao tar tas tat tba tbb tbd tbe tbk tbo tbr tbs tbt tda tdb tdd tde tdk tdo tdr tds tdt te- tea teb ted tee tek teo ter tes tet tka tkb tke tkk tko tkr tks tkt to- toa tob tod toe tok too tor tos tot tra trb trd tre trk tro trr trs trt tsa tsb tsd tse tsk tso tsr tss tst tta ttb ttd tte ttk tto ttr tts ttt