-er a-a a-b a-t aaa aab aae aak aan aao aap aar aas aat ab- aba abb abe abk abn abo abp abr abs abt aea aeb aee aek aen aeo aep aer aes aet aka akb ake akk akn ako akp akr aks an- ana anb ane ank ann ano anp anr ans ant aoa aob aoe aok aon aoo aop aor aos aot ap- apa apb ape apk apn apo app apr aps apt ar- ara arb are ark arn aro arp arr ars art as- asa asb ase ask asn aso asp asr ass ast at- ata atb ate atn ato atp atr ats att b-p baa bab bae bak ban bao bap bar bas bat bba bbb bbe bbk bbn bbo bbp bbr bbs bbt be- bea beb bee bek ben beo bep ber bes bet bka bkb bke bkk bkn bko bkp bkr bks bkt bna bnb bne bnk bnn bno bnp bnr bns bnt boa bob boe bok bon boo bop bor bos bot bpa bpb bpe bpn bpo bpp bpr bps bpt bra brb bre brk brn bro brp brr brs brt bsa bsb bse bsk bsn bso bsp bsr bss bst bta btb bte btk btn bto btp btr bts btt eaa eab eae eak ean eao eap ear eas eat eba ebb ebe ebk ebn ebo ebp ebr ebs ebt eea eeb eee eek een eeo eep eer ees eet eka ekb eke eko ekp ekr eks ekt en- ena enb ene enk enn eno enp enr ens ent eo- eoa eob eoe eok eon eoo eop eor eos eot ep- epa epb epe epn epo epp epr eps ept era erb ere erk ern ero erp err ers ert es- esa esb ese esk esn eso esp esr ess est eta etb ete etk etn eto etp etr ets ett k-t ka- kaa kab kae kak kan kao kap kar kas kat kba kbb kbe kbk kbn kbo kbp kbr kbs ke- kea keb kee kek ken keo kep ker kes ket kkb kke kkk kkn kkp kkr kks kkt kn- kna kne knk knn kno knp knr knt koa kob koe kok kon koo kop kor kos kot kpa kpe kpk kpn kpo kpp kpr kps kpt kra krk krn kro krp krr krs krt ksa ksb kse ksk ksn kso ksp ksr kss kst kta ktb kte ktk ktn kto ktp ktr kts ktt naa nab nae nak nan nao nap nar nas nat nba nbb nbe nbk nbn nbo nbp nbr nbs nbt ne- nea neb nee nek nen neo nep ner nes net nka nke nkk nkn nko nkp nkr nks nkt nna nnb nne nnk nnn nno nnp nns nnt no- noa nob noe nok non noo nop nor nos not npa npb npe npn npo npp npr nps npt nra nrb nre nrk nrn nro nrp nrr nrs nrt nsa nsb nse nsk nsn nso nsp nsr nss nst nta ntb nte ntk ntn nto ntp ntr nts ntt oaa oab oae oak oan oao oap oar oas oat ob- oba obb obe obk obn obo obp obr obs obt oea oeb oee oen oeo oep oer oes oet oka okb oke okk oko okp okr oks on- ona onb one onk onn ono onp onr ons ont oo- ooa oob ook oon ooo oop oor oos oot op- opa opb ope opk opn opo opp opr ops opt or- ora orb ore ork orn oro orp orr ors ort os- osa osb ose osk osn oso osp osr oss ost ot- ota otb ote otk otn oto otp otr ots ott p-p paa pab pae pak pan pao pap par pas pat pba pbb pbe pbk pbn pbo pbp pbr pbs pbt pea peb pee pek pen peo pep per pes pet pka pkb pke pkn pko pkp pkr pks pkt pn- pna pnb pne pnk pnn pno pnp pnr pns pnt poa pob poe pok pon poo pop por pos pot ppa ppb ppe ppk ppn ppo ppp ppr pps ppt pra prb pre prk prn pro prp prr prs prt ps- psa psb pse psk psn pso psp psr pss pst pt- pta ptb pte ptk ptn pto ptp ptr pts ptt ra- raa rab rae rak ran rao rap rar ras rat rba rbb rbe rbk rbn rbo rbp rbr rbs rbt re- rea reb ree rek ren reo rep rer res ret rkb rke rkk rko rkp rks rkt rna rnb rnn rno rnp rnr rns rnt roa rob roe rok ron roo rop ror ros rot rpa rpb rpe rpk rpn rpo rpp rpr rps rpt rra rrb rrk rrn rrp rrr rrs rrt rsa rsb rse rsk rsn rso rsp rsr rss rst rta rtb rte rtk rtn rto rtp rtr rts rtt saa sab sae sak san sao sap sar sas sat sba sbb sbe sbk sbn sbo sbp sbr sbs sbt se- sea seb see sek sen seo sep ser ses set sk- ska skb ske skk sko skp skr sks skt sna snb sne snk snn sno snp snr sns snt soa sob soe sok son soo sop sor sos sot spa spb spe spk spn spo spp spr sps spt sr- sra srb sre srk srn sro srp srr srs srt ss- ssa ssb sse ssk ssn sso ssp ssr sss sst sta stb ste stk stn sto stp str sts stt taa tab tae tak tan tao tap tar tas tat tba tbb tbe tbk tbn tbo tbp tbr tbs tbt te- tea teb tee tek ten teo tep ter tes tet tka tkb tke tkk tko tkp tkr tks tkt tna tnb tne tnk tnn tno tnp tnr tns tnt to- toa tob toe tok ton too top tor tos tot tpa tpb tpe tpk tpn tpo tpp tpr tps tpt tra trb tre trk trn tro trp trr trs trt tsa tsb tse tsk tsn tso tsp tsr tss tst