-er a-a a-b a-c a-t aaa aab aac aae aak aao aap aar aas aat ab- aba abb abc abe abk abo abp abr abs abt ac- aca acb acc ace ack aco acp acr acs act aea aeb aec aee aek aeo aep aer aes aet aka akb akc ake akk ako akp akr aks aoa aob aoc aoe aok aoo aop aor aos aot ap- apa apb apc ape apk apo app apr aps apt ar- ara arb arc are ark aro arp arr ars art as- asa asb asc ase ask aso asp asr ass ast at- ata atb atc ate ato atp atr ats att b-p baa bab bac bae bak bao bap bar bas bat bba bbb bbc bbe bbk bbo bbp bbr bbs bbt bca bcb bcc bce bck bco bcp bcr bcs bct be- bea beb bec bee bek beo bep ber bes bet bka bkb bkc bke bkk bko bkp bkr bks bkt boa bob boc boe bok boo bop bor bos bot bpa bpb bpc bpe bpo bpp bpr bps bpt bra brb bre brk bro brp brr brs brt bsa bsb bsc bse bsk bso bsp bsr bss bst bta btb btc bte btk bto btp btr bts btt c-- caa cab cac cae cak cao cap car cas cat cba cbb cbc cbe cbk cbo cbp cbr cbs cbt cca ccb ccc cce cck cco ccp ccr ccs cct ce- cea ceb cec cee cek ceo cep cer ces cet cka ckb ckc cko cks ckt co- coa cob coc coe cok coo cop cor cos cot cpa cpb cpc cpe cpk cpo cpp cpr cps cpt cra crb crc cre crk cro crp crr crs crt csa csb csc cse csk cso csp csr css cst cta ctb ctc cte ctk cto ctp ctr cts ctt eaa eab eac eae eak eao eap ear eas eat eba ebb ebc ebe ebk ebo ebp ebr ebs ebt ec- eca ecb ecc ece eck eco ecr ecs ect eea eeb eec eee eek eeo eep eer ees eet eka ekb ekc eke eko ekp ekr eks ekt eo- eoa eob eoc eoe eok eoo eop eor eos eot ep- epa epb epc epe epo epp epr eps ept era erb erc ere erk ero erp err ers ert es- esa esb esc ese esk eso esp esr ess est eta etb etc ete etk eto etp etr ets ett k-t ka- kaa kab kac kae kak kao kap kar kas kat kba kbb kbc kbe kbk kbo kbp kbr kbs kca kcb kcc kce kck kcp kcr kcs kct ke- kea keb kec kee kek keo kep ker kes ket kkb kkc kke kkk kkp kkr kks kkt koa kob koc koe kok koo kop kor kos kot kpa kpc kpe kpk kpo kpp kpr kps kpt kra krc krk kro krp krr krs krt ksa ksb ksc kse ksk kso ksp ksr kss kst kta ktb ktc kte ktk kto ktp ktr kts ktt oaa oab oac oae oak oao oap oar oas oat ob- oba obb obc obe obk obo obp obr obs obt oc- oca ocb occ ock oco ocp ocr ocs oct oea oeb oec oee oeo oep oer oes oet oka okb okc oke okk oko okp okr oks oo- ooa oob ooc ook ooo oop oor oos oot op- opa opb opc ope opk opo opp opr ops opt or- ora orb orc ore ork oro orp orr ors ort os- osa osb osc ose osk oso osp osr oss ost ot- ota otb otc ote otk oto otp otr ots ott p-p paa pab pac pae pak pao pap par pas pat pba pbb pbc pbe pbk pbo pbp pbr pbs pbt pca pcb pcc pce pck pco pcp pcr pcs pct pea peb pec pee pek peo pep per pes pet pka pkb pkc pke pko pkp pkr pks pkt poa pob poc poe pok poo pop por pos pot ppa ppb ppc ppe ppk ppo ppp ppr pps ppt pra prb prc pre prk pro prp prr prs prt ps- psa psb psc pse psk pso psp psr pss pst pt- pta ptb ptc pte ptk pto ptp ptr pts ptt ra- raa rab rac rae rak rao rap rar ras rat rba rbb rbc rbe rbk rbo rbp rbr rbs rbt rca rcb rcc rce rco rcp rcr rcs rct re- rea reb rec ree rek reo rep rer res ret rkb rkc rke rkk rko rkp rks rkt roa rob roc roe rok roo rop ror ros rot rpa rpb rpc rpe rpk rpo rpp rpr rps rpt rra rrb rrc rrk rrp rrr rrs rrt rsa rsb rsc rse rsk rso rsp rsr rss rst rta rtb rtc rte rtk rto rtp rtr rts rtt saa sab sac sae sak sao sap sar sas sat sba sbb sbc sbe sbk sbo sbp sbr sbs sbt sca scb scc sce sck sco scp scr scs sct se- sea seb sec see sek seo sep ser ses set sk- ska skb skc ske skk sko skp skr sks skt soa sob soc soe sok soo sop sor sos sot spa spb spc spe spk spo spp spr sps spt sr- sra srb src sre srk sro srp srr srs srt ss- ssa ssb ssc sse ssk sso ssp ssr sss sst sta stb stc ste stk sto stp str sts stt taa tab tac tae tak tao tap tar tas tat tba tbb tbc tbe tbk tbo tbp tbr tbs tbt tca tcb tcc tce tck tco tcp tcr tcs tct te- tea teb tec tee tek teo tep ter tes tet tka tkb tkc tke tkk tko tkp tkr tks tkt to- toa tob toc toe tok too top tor tos tot tpa tpb tpc tpe tpk tpo tpp tpr tps tpt tra trb trc tre trk tro trp trr trs trt tsa tsb tsc tse tsk tso tsp