-er a-a a-b a-i a-t aaa aab aad aae aai aao aap aar aas aat ab- aba abb abd abe abi abo abp abr abs abt ad- ada adb add ade adi ado adp adr ads adt aea aeb aed aee aei aeo aep aer aes aet ai- aia aib aid aie aii aio aip air ais ait aoa aob aod aoe aoi aoo aop aor aos aot ap- apa apb apd ape api apo app apr aps apt ar- ara arb ard are ari aro arp arr ars art as- asa asb asd ase asi aso asp asr ass ast at- ata atb atd ate ati ato atp atr ats att b-p baa bab bad bae bai bao bap bar bas bat bba bbb bbd bbe bbi bbo bbp bbr bbs bbt bda bdb bdd bde bdi bdo bdp bdr bds bdt be- bea beb bed bee bei beo bep ber bes bet bi- bia bib bid bie bii bio bip bir bis bit boa bob bod boe boi boo bop bor bos bot bpa bpb bpd bpe bpi bpo bpp bpr bps bpt bra brb brd bre bri bro brp brr brs brt bsa bsb bsd bse bsi bso bsp bsr bss bst bta btb btd bte bti bto btp btr bts btt daa dab dad dae dai dao dap dar das dat dba dbb dbd dbe dbi dbo dbp dbr dbs dbt dda ddb ddd dde ddi ddo ddp ddr dds ddt de- dea deb ded dee dei deo dep der des det di- dia dib did die dii dio dip dir dis dit doa dob dod doe doi doo dop dor dos dot dpa dpb dpd dpe dpi dpo dpp dpr dps dpt dra drb drd dre dri dro drp drr drs drt dsa dsb dsd dse dsi dso dsp dsr dss dst dta dtb dtd dte dti dto dtp dtr dts dtt eaa eab ead eae eai eao eap ear eas eat eba ebb ebd ebe ebi ebo ebp ebr ebs ebt ed- eda edb edd ede edi edo edp edr eds edt eea eeb eed eee eeo eep eer ees eet eia eib eid eie eii eio eip eir eis eit eo- eoa eob eod eoe eoi eoo eop eor eos eot ep- epa epb epd epe epi epo epp epr eps ept era erb erd ere eri ero erp err ers ert es- esa esb esd ese esi eso esp esr ess est eta etb etd ete eti eto etp etr ets ett i-d ia- iaa iab iad iae iai iao iap iar ias iat iba ibb ibd ibe ibi ibo ibp ibr ibs ibt ida idb idd ide idi ido idp idr ids idt ie- iea ied iee iei iep ier ies iet iia iib iid iie iii iio iip iir iis iit io- ioa iob iod ioe ioi ioo iop ior ios iot ipa ipb ipd ipe ipi ipo ipp ipr ips ipt ir- ira irb ird ire iri iro irp irr irs irt is- isa isb isd ise isi iso isp isr iss ist ita itb itd ite iti ito itp its itt o-i oaa oab oad oae oai oao oap oar oas oat ob- oba obb obd obe obi obo obp obr obs obt oda odb odd ode odi odo odp odr ods odt oea oeb oed oee oei oeo oep oer oes oet oia oib oid oie oii oio oip oir ois oit oo- ooa oob ood ooi ooo oop oor oos oot op- opa opb opd ope opi opo opp opr ops opt or- ora orb ord ore ori oro orp orr ors ort os- osa osb osd ose osi oso osp osr oss ost ot- ota otb otd ote oti oto otp otr ots ott p-p paa pab pad pae pai pao pap par pas pat pba pbb pbd pbe pbi pbo pbp pbr pbs pbt pda pdb pdd pde pdi pdo pdp pdr pds pdt pea peb ped pee pei peo pep per pes pet pia pib pid pie pii pio pip pir pis pit poa pob pod poe poi poo pop por pos pot ppa ppb ppd ppe ppi ppo ppp ppr pps ppt pra prb prd pre pri pro prp prr prs prt ps- psa psb psd pse psi pso psp psr pss pst pt- pta ptb ptd pte pti pto ptp ptr pts ptt ra- raa rab rad rae rai rao rap rar ras rat rba rbb rbd rbe rbi rbo rbp rbr rbs rbt rda rdb rdd rde rdi rdo rdp rdr rds rdt re- rea reb red ree rei reo rep rer res ret ria rib rid rie rii rio rip rir ris rit roa rob rod roe roi roo rop ror ros rot rpa rpb rpd rpe rpi rpo rpp rpr rps rpt rra rrb rrd rri rrp rrr rrs rrt rsa rsb rsd rse rsi rso rsp rsr rss rst rta rtb rtd rte rti rto rtp rtr rts rtt saa sab sad sae sai sao sap sar sas sat sba sbb sbd sbe sbi sbo sbp sbr sbs sbt sda sdb sdd sde sdi sdo sdp sdr sds sdt se- sea seb sed see sei seo sep ser ses set sia sib sid sie sii sio sip sir sis sit soa sob sod soe soi soo sop sor sos sot spa spb spd spe spi spo spp spr sps spt sr- sra srb srd sre sri sro srp srr srs srt ss- ssa ssb ssd sse ssi sso ssp ssr sss sst sta stb std ste sti sto stp str sts stt taa tab tad tae tai tao tap tar tas tat tba tbb tbd tbe tbi tbo tbp tbr tbs tbt tda tdb tdd tde tdi tdo tdp tdr tds tdt te- tea teb ted tee tei teo tep ter tes tet tia tib tid tie tii tio tip tir tis tit to- toa tob tod toe toi too top tor tos tot tpa tpb tpd