-er a-a a-b a-t aaa aab aad aae aak aao aap aar aas aat ab- aba abb abd abe abk abo abp abr abs abt ad- ada adb add ade adk ado adp adr ads adt aea aeb aed aee aek aeo aep aer aes aet aka akb akd ake akk ako akp akr aks aoa aob aod aoe aok aoo aop aor aos aot ap- apa apb apd ape apk apo app apr aps apt ar- ara arb ard are ark aro arp arr ars art as- asa asb asd ase ask aso asp asr ass ast at- ata atb atd ate ato atp atr ats att b-p baa bab bad bae bak bao bap bar bas bat bba bbb bbd bbe bbk bbo bbp bbr bbs bbt bda bdb bdd bde bdk bdo bdp bdr bds bdt be- bea beb bed bee bek beo bep ber bes bet bka bkb bke bkk bko bkp bkr bks bkt boa bob bod boe bok boo bop bor bos bot bpa bpb bpd bpe bpo bpp bpr bps bpt bra brb brd bre brk bro brp brr brs brt bsa bsb bsd bse bsk bso bsp bsr bss bst bta btb btd bte btk bto btp btr bts btt daa dab dad dae dak dao dap dar das dat dba dbb dbd dbe dbk dbo dbp dbr dbs dbt dda ddb ddd dde ddk ddo ddp ddr dds ddt de- dea deb ded dee dek deo dep der des det dka dkb dke dkk dko dkp dkr dks dkt doa dob dod doe dok doo dop dor dos dot dpa dpb dpd dpe dpk dpo dpp dpr dps dpt dra drb drd dre drk dro drp drr drs drt dsa dsb dsd dse dsk dso dsp dsr dss dst dta dtb dtd dte dtk dto dtp dtr dts dtt eaa eab ead eae eak eao eap ear eas eat eba ebb ebd ebe ebk ebo ebp ebr ebs ebt ed- eda edb edd ede edk edo edp edr eds edt eea eeb eed eee eek eeo eep eer ees eet eka ekb ekd eke eko ekp ekr eks ekt eo- eoa eob eod eoe eok eoo eop eor eos eot ep- epa epb epd epe epo epp epr eps ept era erb erd ere erk ero erp err ers ert es- esa esb esd ese esk eso esp esr ess est eta etb etd ete etk eto etp etr ets ett k-t ka- kaa kab kad kae kak kao kap kar kas kat kba kbb kbd kbe kbk kbo kbp kbr kbs kda kdb kde kdk kdo kdp kdr kds kdt ke- kea keb ked kee kek keo kep ker kes ket kkb kke kkk kkp kkr kks kkt koa kob kod koe kok koo kop kor kos kot kpa kpd kpe kpk kpo kpp kpr kps kpt kra krd krk kro krp krr krs krt ksa ksb ksd kse ksk kso ksp ksr kss kst kta ktb kte ktk kto ktp ktr kts ktt oaa oab oad oae oak oao oap oar oas oat ob- oba obb obd obe obk obo obp obr obs obt oda odb odd ode odo odp odr ods odt oea oeb oed oee oeo oep oer oes oet oka okb okd oke okk oko okp okr oks oo- ooa oob ood ook ooo oop oor oos oot op- opa opb opd ope opk opo opp opr ops opt or- ora orb ord ore ork oro orp orr ors ort os- osa osb osd ose osk oso osp osr oss ost ot- ota otb otd ote otk oto otp otr ots ott p-p paa pab pad pae pak pao pap par pas pat pba pbb pbd pbe pbk pbo pbp pbr pbs pbt pda pdb pdd pde pdk pdo pdp pdr pds pdt pea peb ped pee pek peo pep per pes pet pka pkb pkd pke pko pkp pkr pks pkt poa pob pod poe pok poo pop por pos pot ppa ppb ppd ppe ppk ppo ppp ppr pps ppt pra prb prd pre prk pro prp prr prs prt ps- psa psb psd pse psk pso psp psr pss pst pt- pta ptb ptd pte ptk pto ptp ptr pts ptt ra- raa rab rad rae rak rao rap rar ras rat rba rbb rbd rbe rbk rbo rbp rbr rbs rbt rda rdb rdd rde rdo rdp rdr rds rdt re- rea reb red ree rek reo rep rer res ret rkb rke rkk rko rkp rks rkt roa rob rod roe rok roo rop ror ros rot rpa rpb rpd rpe rpk rpo rpp rpr rps rpt rra rrb rrd rrk rrp rrr rrs rrt rsa rsb rsd rse rsk rso rsp rsr rss rst rta rtb rtd rte rtk rto rtp rtr rts rtt saa sab sad sae sak sao sap sar sas sat sba sbb sbd sbe sbk sbo sbp sbr sbs sbt sda sdb sdd sde sdk sdo sdp sdr sds sdt se- sea seb sed see sek seo sep ser ses set sk- ska skb skd ske skk sko skp skr sks skt soa sob sod soe sok soo sop sor sos sot spa spb spd spe spk spo spp spr sps spt sr- sra srb srd sre srk sro srp srr srs srt ss- ssa ssb ssd sse ssk sso ssp ssr sss sst sta stb std ste stk sto stp str sts stt taa tab tad tae tak tao tap tar tas tat tba tbb tbd tbe tbk tbo tbp tbr tbs tbt tda tdb tdd tde tdk tdo tdp tdr tds tdt te- tea teb ted tee tek teo tep ter tes tet tka tkb tke tkk tko tkp tkr tks tkt to- toa tob tod toe tok too top tor tos tot tpa tpb tpd tpe tpk tpo tpp tpr tps tpt tra trb trd tre trk tro trp trr trs trt tsa tsb tsd tse tsk tso tsp tsr tss tst tta