-er a-a a-b a-c aaa aab aac aad aae aak aan aap aar aas ab- aba abb abc abd abe abk abn abp abr abs ac- aca acb acc acd ace ack acn acp acr acs ad- ada adb adc add ade adk adn adp adr ads aea aeb aec aed aee aek aen aep aer aes aka akb akc akd ake akk akn akp akr aks an- ana anb anc and ane ank ann anp anr ans ap- apa apb apc apd ape apk apn app apr aps ar- ara arb arc ard are ark arn arp arr ars as- asa asb asc asd ase ask asn asp asr ass b-p baa bab bac bad bae bak ban bap bar bas bba bbb bbc bbd bbe bbk bbn bbp bbr bbs bca bcb bcc bcd bce bck bcn bcp bcr bcs bda bdb bdc bdd bde bdk bdp bdr bds be- bea beb bec bed bee bek ben bep ber bes bka bkb bkc bke bkk bkn bkp bkr bks bna bnb bnc bnd bne bnk bnn bnp bnr bns bpa bpb bpc bpd bpe bpn bpp bpr bps bra brb brd bre brk brn brp brr brs bsa bsb bsc bsd bse bsk bsn bsp bsr bss c-- caa cab cac cad cae cak can cap car cas cba cbb cbc cbd cbe cbk cbn cbp cbr cbs cca ccb ccc ccd cce cck ccn ccp ccr ccs cda cdb cdc cdd cde cdk cdn cdp cdr cds ce- cea ceb cec ced cee cek cen cep cer ces cka ckb ckc ckd cks cn- cna cnb cnc cnd cne cnn cnp cnr cns cpa cpb cpc cpd cpe cpk cpn cpp cpr cps cra crb crc crd cre crk crn crp crr crs csa csb csc csd cse csk csn csp csr css daa dab dac dad dae dak dan dap dar das dba dbb dbc dbd dbe dbk dbn dbp dbr dbs dca dcb dcc dcd dce dck dcn dcp dcr dcs dda ddb ddc ddd dde ddk ddn ddp ddr dds de- dea deb dec ded dee dek den dep der des dka dkb dkc dke dkk dkp dkr dks dna dnb dnc dnd dne dnk dnn dnp dnr dns dpa dpb dpc dpd dpe dpk dpn dpp dpr dps dra drb drc drd dre drk drn drp drr drs dsa dsb dsc dsd dse dsk dsn dsp dsr dss eaa eab eac ead eae eak ean eap ear eas eba ebb ebc ebd ebe ebk ebn ebp ebr ebs ec- eca ecb ecc ecd ece eck ecn ecr ecs ed- eda edb edc edd ede edk edn edp edr eds eea eeb eec eed eee eek een eep eer ees eka ekb ekc ekd eke ekp ekr eks en- ena enb enc end ene enk enn enp enr ens ep- epa epb epc epd epe epn epp epr eps era erb erc erd ere erk ern erp err ers es- esa esb esc esd ese esk esn esp esr ess ka- kaa kab kac kad kae kak kan kap kar kas kba kbb kbc kbd kbe kbk kbn kbp kbr kbs kca kcb kcc kcd kce kck kcn kcp kcr kcs kda kdb kdc kde kdk kdp kdr kds ke- kea keb kec ked kee kek ken kep ker kes kkb kkc kke kkk kkn kkp kkr kks kn- kna knc knd kne knk knn knp knr kpa kpc kpd kpe kpk kpn kpp kpr kps kra krc krd krk krn krp krr krs ksa ksb ksc ksd kse ksk ksn ksp ksr kss naa nab nac nad nae nak nan nap nar nas nba nbb nbc nbd nbe nbk nbn nbp nbr nbs nca ncb ncc ncd nce nck ncn ncp ncr ncs nda ndb ndc ndd nde ndk ndn ndp ndr nds ne- nea neb nec ned nee nek nen nep ner nes nka nkc nke nkk nkn nkp nkr nks nna nnb nnc nne nnk nnn nnp nns npa npb npc npd npe npn npp npr nps nra nrb nrc nrd nre nrk nrn nrp nrr nrs nsa nsb nsc nsd nse nsk nsn nsp nsr nss p-p paa pab pac pad pae pak pan pap par pas pba pbb pbc pbd pbe pbk pbn pbp pbr pbs pca pcb pcc pcd pce pck pcn pcp pcr pcs pda pdb pdc pdd pde pdk pdn pdp pdr pds pea peb pec ped pee pek pen pep per pes pka pkb pkc pkd pke pkn pkp pkr pks pn- pna pnb pnc pnd pne pnk pnn pnp pnr pns ppa ppb ppc ppd ppe ppk ppn ppp ppr pps pra prb prc prd pre prk prn prp prr prs ps- psa psb psc psd pse psk psn psp psr pss ra- raa rab rac rad rae rak ran rap rar ras rba rbb rbc rbd rbe rbk rbn rbp rbr rbs rca rcb rcc rcd rce rcn rcp rcr rcs rda rdb rdc rdd rde rdn rdp rdr rds re- rea reb rec red ree rek ren rep rer res rkb rkc rke rkk rkp rks rna rnb rnc rnd rnn rnp rnr rns rpa rpb rpc rpd rpe rpk rpn rpp rpr rps rra rrb rrc rrd rrk rrn rrp rrr rrs rsa rsb rsc rsd rse rsk rsn rsp rsr rss saa sab sac sad sae sak san sap sar sas sba sbb sbc sbd sbe sbk sbn sbp sbr sbs sca scb scc scd sce sck scn scp scr scs sda sdb sdc sdd sde sdk sdn sdp sdr sds se- sea seb sec sed see sek sen sep ser ses sk- ska skb skc skd ske skk skp skr sks sna snb snc snd sne snk snn snp snr sns spa spb spc spd spe spk spn spp spr sps sr- sra srb src srd sre srk srn srp srr srs ss- ssa ssb ssc ssd sse ssk ssn ssp ssr sss