-er a-a a-b a-t aaa aab aad aae aan aao aap aar aas aat ab- aba abb abd abe abn abo abp abr abs abt ad- ada adb add ade adn ado adp adr ads adt aea aeb aed aee aen aeo aep aer aes aet an- ana anb and ane ann ano anp anr ans ant aoa aob aod aoe aon aoo aop aor aos aot ap- apa apb apd ape apn apo app apr aps apt ar- ara arb ard are arn aro arp arr ars art as- asa asb asd ase asn aso asp asr ass ast at- ata atb atd ate atn ato atp atr ats att b-p baa bab bad bae ban bao bap bar bas bat bba bbb bbd bbe bbn bbo bbp bbr bbs bbt bda bdb bdd bde bdo bdp bdr bds bdt be- bea beb bed bee ben beo bep ber bes bet bna bnb bnd bne bnn bno bnp bnr bns bnt boa bob bod boe bon boo bop bor bos bot bpa bpb bpd bpe bpn bpo bpp bpr bps bpt bra brb brd bre brn bro brp brr brs brt bsa bsb bsd bse bsn bso bsp bsr bss bst bta btb btd bte btn bto btp btr bts btt daa dab dad dae dan dao dap dar das dat dba dbb dbd dbe dbn dbo dbp dbr dbs dbt dda ddb ddd dde ddn ddo ddp ddr dds ddt de- dea deb ded dee den deo dep der des det dna dnb dnd dne dnn dno dnp dnr dns dnt doa dob dod doe don doo dop dor dos dot dpa dpb dpd dpe dpn dpo dpp dpr dps dpt dra drb drd dre drn dro drp drr drs drt dsa dsb dsd dse dsn dso dsp dsr dss dst dta dtb dtd dte dtn dto dtp dtr dts dtt eaa eab ead eae ean eao eap ear eas eat eba ebb ebd ebe ebn ebo ebp ebr ebs ebt ed- eda edb edd ede edn edo edp edr eds edt eea eeb eed eee een eeo eep eer ees eet en- ena enb end ene enn eno enp enr ens ent eo- eoa eob eod eoe eon eoo eop eor eos eot ep- epa epb epd epe epn epo epp epr eps ept era erb erd ere ern ero erp err ers ert es- esa esb esd ese esn eso esp esr ess est eta etb etd ete etn eto etp etr ets ett naa nab nad nae nan nao nap nar nas nat nba nbb nbd nbe nbn nbo nbp nbr nbs nbt nda ndb ndd nde ndn ndo ndp ndr nds ndt ne- nea neb ned nee nen neo nep ner nes net nna nnb nne nnn nno nnp nns nnt no- noa nob nod noe non noo nop nor nos not npa npb npd npe npn npo npp npr nps npt nra nrb nrd nre nrn nro nrp nrr nrs nrt nsa nsb nsd nse nsn nso nsp nsr nss nst nta ntb ntd nte ntn nto ntp ntr nts ntt oaa oab oad oae oan oao oap oar oas oat ob- oba obb obd obe obn obo obp obr obs obt oda odb odd ode odn odo odp odr ods odt oea oeb oed oee oen oeo oep oer oes oet on- ona onb ond one onn ono onp onr ons ont oo- ooa oob ood oon ooo oop oor oos oot op- opa opb opd ope opn opo opp opr ops opt or- ora orb ord ore orn oro orp orr ors ort os- osa osb osd ose osn oso osp osr oss ost ot- ota otb otd ote otn oto otp otr ots ott p-p paa pab pad pae pan pao pap par pas pat pba pbb pbd pbe pbn pbo pbp pbr pbs pbt pda pdb pdd pde pdn pdo pdp pdr pds pdt pea peb ped pee pen peo pep per pes pet pn- pna pnb pnd pne pnn pno pnp pnr pns pnt poa pob pod poe pon poo pop por pos pot ppa ppb ppd ppe ppn ppo ppp ppr pps ppt pra prb prd pre prn pro prp prr prs prt ps- psa psb psd pse psn pso psp psr pss pst pt- pta ptb ptd pte ptn pto ptp ptr pts ptt ra- raa rab rad rae ran rao rap rar ras rat rba rbb rbd rbe rbn rbo rbp rbr rbs rbt rda rdb rdd rde rdn rdo rdp rdr rds rdt re- rea reb red ree ren reo rep rer res ret rna rnb rnd rnn rno rnp rnr rns rnt roa rob rod roe ron roo rop ror ros rot rpa rpb rpd rpe rpn rpo rpp rpr rps rpt rra rrb rrd rrn rrp rrr rrs rrt rsa rsb rsd rse rsn rso rsp rsr rss rst rta rtb rtd rte rtn rto rtp rtr rts rtt saa sab sad sae san sao sap sar sas sat sba sbb sbd sbe sbn sbo sbp sbr sbs sbt sda sdb sdd sde sdn sdo sdp sdr sds sdt se- sea seb sed see sen seo sep ser ses set sna snb snd sne snn sno snp snr sns snt soa sob sod soe son soo sop sor sos sot spa spb spd spe spn spo spp spr sps spt sr- sra srb srd sre srn sro srp srr srs srt ss- ssa ssb ssd sse ssn sso ssp ssr sss sst sta stb std ste stn sto stp str sts stt taa tab tad tae tan tao tap tar tas tat tba tbb tbd tbe tbn tbo tbp tbr tbs tbt tda tdb tdd tde tdn tdo tdp tdr tds tdt te- tea teb ted tee ten teo tep ter tes tet tna tnb tnd tne tnn tno tnp tnr tns tnt to- toa tob tod toe ton too top tor tos tot tpa tpb tpd tpe tpn tpo tpp tpr