-er a-a a-b aaa aab aad aae aan aap aar aas ab- aba abb abd abe abn abp abr abs ad- ada adb add ade adn adp adr ads aea aeb aed aee aen aep aer aes an- ana anb and ane ann anp anr ans ap- apa apb apd ape apn app apr aps ar- ara arb ard are arn arp arr ars as- asa asb asd ase asn asp asr ass b-p baa bab bad bae ban bap bar bas bba bbb bbd bbe bbn bbp bbr bbs bda bdb bdd bde bdp bdr bds be- bea beb bed bee ben bep ber bes bna bnb bnd bne bnn bnp bnr bns bpa bpb bpd bpe bpn bpp bpr bps bra brb brd bre brn brp brr brs bsa bsb bsd bse bsn bsp bsr bss daa dab dad dae dan dap dar das dba dbb dbd dbe dbn dbp dbr dbs dda ddb ddd dde ddn ddp ddr dds de- dea deb ded dee den dep der des dna dnb dnd dne dnn dnp dnr dns dpa dpb dpd dpe dpn dpp dpr dps dra drb drd dre drn drp drr drs dsa dsb dsd dse dsn dsp dsr dss eaa eab ead eae ean eap ear eas eba ebb ebd ebe ebn ebp ebr ebs ed- eda edb edd ede edn edp edr eds eea eeb eed eee een eep eer ees en- ena enb end ene enn enp enr ens ep- epa epb epd epe epn epp epr eps era erb erd ere ern erp err ers es- esa esb esd ese esn esp esr ess naa nab nad nae nan nap nar nas nba nbb nbd nbe nbn nbp nbr nbs nda ndb ndd nde ndn ndp ndr nds ne- nea neb ned nee nen nep ner nes nna nnb nne nnn nnp nns npa npb npd npe npn npp npr nps nra nrb nrd nre nrn nrp nrr nrs nsa nsb nsd nse nsn nsp nsr nss p-p paa pab pad pae pan pap par pas pba pbb pbd pbe pbn pbp pbr pbs pda pdb pdd pde pdn pdp pdr pds pea peb ped pee pen pep per pes pn- pna pnb pnd pne pnn pnp pnr pns ppa ppb ppd ppe ppn ppp ppr pps pra prb prd pre prn prp prr prs ps- psa psb psd pse psn psp psr pss ra- raa rab rad rae ran rap rar ras rba rbb rbd rbe rbn rbp rbr rbs rda rdb rdd rde rdn rdp rdr rds re- rea reb red ree ren rep rer res rna rnb rnd rnn rnp rnr rns rpa rpb rpd rpe rpn rpp rpr rps rra rrb rrd rrn rrp rrr rrs rsa rsb rsd rse rsn rsp rsr rss saa sab sad sae san sap sar sas sba sbb sbd sbe sbn sbp sbr sbs sda sdb sdd sde sdn sdp sdr sds se- sea seb sed see sen sep ser ses sna snb snd sne snn snp snr sns spa spb spd spe spn spp spr sps sr- sra srb srd sre srn srp srr srs ss- ssa ssb ssd sse ssn ssp ssr sss