-er a-a a-b a-t aaa aab aad aae aaf aak aao aar aas aat ab- aba abb abd abe abf abk abo abr abs abt ad- ada adb add ade adf adk ado adr ads adt aea aeb aed aee aef aek aeo aer aes aet af- afa afb afd afe aff afk afo afr afs aft aka akb akd ake akk ako akr aks aoa aob aod aoe aof aok aoo aor aos aot ar- ara arb ard are arf ark aro arr ars art as- asa asb asd ase asf ask aso asr ass ast at- ata atb atd ate atf ato atr ats att baa bab bad bae baf bak bao bar bas bat bba bbb bbd bbe bbf bbk bbo bbr bbs bbt bda bdb bdd bde bdf bdk bdo bdr bds bdt be- bea beb bed bee bef bek beo ber bes bet bfa bfb bfd bfe bff bfo bfr bfs bft bka bkb bke bkf bkk bko bkr bks bkt boa bob bod boe bof bok boo bor bos bot bra brb brd bre brf brk bro brr brs brt bsa bsb bsd bse bsf bsk bso bsr bss bst bta btb btd bte btf btk bto btr bts btt daa dab dad dae daf dak dao dar das dat dba dbb dbd dbe dbf dbk dbo dbr dbs dbt dda ddb ddd dde ddf ddk ddo ddr dds ddt de- dea deb ded dee def dek deo der des det dfa dfb dfd dfe dff dfk dfo dfr dfs dft dka dkb dke dkk dko dkr dks dkt doa dob dod doe dof dok doo dor dos dot dra drb drd dre drk dro drr drs drt dsa dsb dsd dse dsf dsk dso dsr dss dst dta dtb dtd dte dtf dtk dto dtr dts dtt eaa eab ead eae eaf eak eao ear eas eat eba ebb ebd ebe ebf ebk ebo ebr ebs ebt ed- eda edb edd ede edf edk edo edr eds edt eea eeb eed eee eef eek eeo eer ees eet ef- efa efb efd efe eff efo efr efs eft eka ekb ekd eke ekf eko ekr eks ekt eo- eoa eob eod eoe eof eok eoo eor eos eot era erb erd ere erf erk ero err ers ert es- esa esb esd ese esf esk eso esr ess est eta etb etd ete etf etk eto etr ets ett faa fab fad fae faf fak fao far fas fat fba fbb fbd fbe fbf fbk fbo fbr fbs fbt fda fdb fdd fde fdf fdk fdo fdr fds fdt fea feb fed fee fef fek feo fer fes fet ffa ffd ffe fff ffk ffo ffr ffs fft fka fkb fkf fkk fkt foa fob foe fof fok foo for fos fot fra frb frd fre frf frk fro frr frs frt fsa fsb fsd fse fsf fsk fso fsr fss fst fta ftb ftd fte ftf ftk fto ftr fts ftt k-t ka- kaa kab kad kae kaf kak kao kar kas kat kba kbb kbd kbe kbf kbk kbo kbr kbs kda kdb kde kdf kdk kdo kdr kds kdt ke- kea keb ked kee kef kek keo ker kes ket kfa kfd kff kfo kfs kkb kke kkk kkr kks kkt koa kob kod koe kof kok koo kor kos kot kra krd krf krk kro krr krs krt ksa ksb ksd kse ksf ksk kso ksr kss kst kta ktb kte ktf ktk kto ktr kts ktt oaa oab oad oae oaf oak oao oar oas oat ob- oba obb obd obe obf obk obo obr obs obt oda odb odd ode odf odo odr ods odt oea oeb oed oee oef oeo oer oes oet of- ofa ofb ofd ofe off ofo ofr ofs oft oka okb okd oke okk oko okr oks oo- ooa oob ood oof ook ooo oor oos oot or- ora orb ord ore orf ork oro orr ors ort os- osa osb osd ose osf osk oso osr oss ost ot- ota otb otd ote otf otk oto otr ots ott ra- raa rab rad rae raf rak rao rar ras rat rba rbb rbd rbe rbf rbk rbo rbr rbs rbt rda rdb rdd rde rdf rdo rdr rds rdt re- rea reb red ree ref rek reo rer res ret rfa rfb rfd rfe rff rfk rfo rfr rfs rft rkb rke rkf rkk rko rks rkt roa rob rod roe rof rok roo ror ros rot rra rrb rrd rrf rrk rrr rrs rrt rsa rsb rsd rse rsf rsk rso rsr rss rst rta rtb rtd rte rtf rtk rto rtr rts rtt saa sab sad sae saf sak sao sar sas sat sba sbb sbd sbe sbf sbk sbo sbr sbs sbt sda sdb sdd sde sdf sdk sdo sdr sds sdt se- sea seb sed see sef sek seo ser ses set sfa sfb sfd sfe sff sfk sfo sfr sfs sft sk- ska skb skd ske skf skk sko skr sks skt soa sob sod soe sof sok soo sor sos sot sr- sra srb srd sre srf srk sro srr srs srt ss- ssa ssb ssd sse ssf ssk sso ssr sss sst sta stb std ste stf stk sto str sts stt taa tab tad tae taf tak tao tar tas tat tba tbb tbd tbe tbf tbk tbo tbr tbs tbt tda tdb tdd tde tdf tdk tdo tdr tds tdt te- tea teb ted tee tef tek teo ter tes tet tfa tfb tfd tfe tff tfk tfo tfr tfs tft tka tkb tke tkk tko tkr tks tkt to- toa tob tod toe tof tok too tor tos tot tra trb trd tre trf trk tro trr trs trt tsa tsb tsd tse tsf tsk tso tsr tss tst tta ttb ttd tte ttf ttk tto ttr tts ttt