-er a-a a-b a-c a-t aaa aab aac aad aae aak aap aar aas aat ab- aba abb abc abd abe abk abp abr abs abt ac- aca acb acc acd ace ack acp acr acs act ad- ada adb adc add ade adk adp adr ads adt aea aeb aec aed aee aek aep aer aes aet aka akb akc akd ake akk akp akr aks ap- apa apb apc apd ape apk app apr aps apt ar- ara arb arc ard are ark arp arr ars art as- asa asb asc asd ase ask asp asr ass ast at- ata atb atc atd ate atp atr ats att b-p baa bab bac bad bae bak bap bar bas bat bba bbb bbc bbd bbe bbk bbp bbr bbs bbt bca bcb bcc bcd bce bck bcp bcr bcs bct bda bdb bdc bdd bde bdk bdp bdr bds bdt be- bea beb bec bed bee bek bep ber bes bet bka bkb bkc bke bkk bkp bkr bks bkt bpa bpb bpc bpd bpe bpp bpr bps bpt bra brb brd bre brk brp brr brs brt bsa bsb bsc bsd bse bsk bsp bsr bss bst bta btb btc btd bte btk btp btr bts btt c-- caa cab cac cad cae cak cap car cas cat cba cbb cbc cbd cbe cbk cbp cbr cbs cbt cca ccb ccc ccd cce cck ccp ccr ccs cct cda cdb cdc cdd cde cdk cdp cdr cds cdt ce- cea ceb cec ced cee cek cep cer ces cet cka ckb ckc ckd cks ckt cpa cpb cpc cpd cpe cpk cpp cpr cps cpt cra crb crc crd cre crk crp crr crs crt csa csb csc csd cse csk csp csr css cst cta ctb ctc ctd cte ctk ctp ctr cts ctt daa dab dac dad dae dak dap dar das dat dba dbb dbc dbd dbe dbk dbp dbr dbs dbt dca dcb dcc dcd dce dck dcp dcr dcs dct dda ddb ddc ddd dde ddk ddp ddr dds ddt de- dea deb dec ded dee dek dep der des det dka dkb dkc dke dkk dkp dkr dks dkt dpa dpb dpc dpd dpe dpk dpp dpr dps dpt dra drb drc drd dre drk drp drr drs drt dsa dsb dsc dsd dse dsk dsp dsr dss dst dta dtb dtc dtd dte dtk dtp dtr dts dtt eaa eab eac ead eae eak eap ear eas eat eba ebb ebc ebd ebe ebk ebp ebr ebs ebt ec- eca ecb ecc ecd ece eck ecr ecs ect ed- eda edb edc edd ede edk edp edr eds edt eea eeb eec eed eee eek eep eer ees eet eka ekb ekc ekd eke ekp ekr eks ekt ep- epa epb epc epd epe epp epr eps ept era erb erc erd ere erk erp err ers ert es- esa esb esc esd ese esk esp esr ess est eta etb etc etd ete etk etp etr ets ett k-t ka- kaa kab kac kad kae kak kap kar kas kat kba kbb kbc kbd kbe kbk kbp kbr kbs kca kcb kcc kcd kce kck kcp kcr kcs kct kda kdb kdc kde kdk kdp kdr kds kdt ke- kea keb kec ked kee kek kep ker kes ket kkb kkc kke kkk kkp kkr kks kkt kpa kpc kpd kpe kpk kpp kpr kps kpt kra krc krd krk krp krr krs krt ksa ksb ksc ksd kse ksk ksp ksr kss kst kta ktb ktc kte ktk ktp ktr kts ktt p-p paa pab pac pad pae pak pap par pas pat pba pbb pbc pbd pbe pbk pbp pbr pbs pbt pca pcb pcc pcd pce pck pcp pcr pcs pct pda pdb pdc pdd pde pdk pdp pdr pds pdt pea peb pec ped pee pek pep per pes pet pka pkb pkc pkd pke pkp pkr pks pkt ppa ppb ppc ppd ppe ppk ppp ppr pps ppt pra prb prc prd pre prk prp prr prs prt ps- psa psb psc psd pse psk psp psr pss pst pt- pta ptb ptc ptd pte ptk ptp ptr pts ptt ra- raa rab rac rad rae rak rap rar ras rat rba rbb rbc rbd rbe rbk rbp rbr rbs rbt rca rcb rcc rcd rce rcp rcr rcs rct rda rdb rdc rdd rde rdp rdr rds rdt re- rea reb rec red ree rek rep rer res ret rkb rkc rke rkk rkp rks rkt rpa rpb rpc rpd rpe rpk rpp rpr rps rpt rra rrb rrc rrd rrk rrp rrr rrs rrt rsa rsb rsc rsd rse rsk rsp rsr rss rst rta rtb rtc rtd rte rtk rtp rtr rts rtt saa sab sac sad sae sak sap sar sas sat sba sbb sbc sbd sbe sbk sbp sbr sbs sbt sca scb scc scd sce sck scp scr scs sct sda sdb sdc sdd sde sdk sdp sdr sds sdt se- sea seb sec sed see sek sep ser ses set sk- ska skb skc skd ske skk skp skr sks skt spa spb spc spd spe spk spp spr sps spt sr- sra srb src srd sre srk srp srr srs srt ss- ssa ssb ssc ssd sse ssk ssp ssr sss sst sta stb stc std ste stk stp str sts stt taa tab tac tad tae tak tap tar tas tat tba tbb tbc tbd tbe tbk tbp tbr tbs tbt tca tcb tcc tcd tce tck tcp tcr tcs tct tda tdb tdc tdd tde tdk tdp tdr tds tdt te- tea teb tec ted tee tek tep ter tes tet tka tkb tkc tke tkk tkp tkr tks tkt tpa tpb tpc tpd tpe tpk tpp tpr tps tpt tra trb trc trd tre trk trp trr trs trt tsa tsb tsc tsd tse tsk tsp tsr tss tst tta ttb ttc ttd tte