-er a-a a-b a-i a-t aaa aab aad aae aai aak aao aar aas aat ab- aba abb abd abe abi abk abo abr abs abt ad- ada adb add ade adi adk ado adr ads adt aea aeb aed aee aei aek aeo aer aes aet ai- aia aib aid aie aii aik aio air ais ait aka akb akd ake aki akk ako akr aks aoa aob aod aoe aoi aok aoo aor aos aot ar- ara arb ard are ari ark aro arr ars art as- asa asb asd ase asi ask aso asr ass ast at- ata atb atd ate ati ato atr ats att baa bab bad bae bai bak bao bar bas bat bba bbb bbd bbe bbi bbk bbo bbr bbs bbt bda bdb bdd bde bdi bdk bdo bdr bds bdt be- bea beb bed bee bei bek beo ber bes bet bi- bia bib bid bie bii bik bio bir bis bit bka bkb bke bkk bko bkr bks bkt boa bob bod boe boi bok boo bor bos bot bra brb brd bre bri brk bro brr brs brt bsa bsb bsd bse bsi bsk bso bsr bss bst bta btb btd bte bti btk bto btr bts btt daa dab dad dae dai dak dao dar das dat dba dbb dbd dbe dbi dbk dbo dbr dbs dbt dda ddb ddd dde ddi ddk ddo ddr dds ddt de- dea deb ded dee dei dek deo der des det di- dia dib did die dii dik dio dir dis dit dka dkb dke dki dkk dko dkr dks dkt doa dob dod doe doi dok doo dor dos dot dra drb drd dre dri drk dro drr drs drt dsa dsb dsd dse dsi dsk dso dsr dss dst dta dtb dtd dte dti dtk dto dtr dts dtt eaa eab ead eae eai eak eao ear eas eat eba ebb ebd ebe ebi ebk ebo ebr ebs ebt ed- eda edb edd ede edi edk edo edr eds edt eea eeb eed eee eek eeo eer ees eet eia eib eid eie eii eik eio eir eis eit eka ekb ekd eke eki eko ekr eks ekt eo- eoa eob eod eoe eoi eok eoo eor eos eot era erb erd ere eri erk ero err ers ert es- esa esb esd ese esi esk eso esr ess est eta etb etd ete eti etk eto etr ets ett i-d ia- iaa iab iad iae iai iao iar ias iat iba ibb ibd ibe ibi ibk ibo ibr ibs ibt ida idb idd ide idi idk ido idr ids idt ie- iea ied iee iei iek ier ies iet iia iib iid iie iii iio iir iis iit ika ikb ike iki ikk iko ikr iks ikt io- ioa iob iod ioe ioi ioo ior ios iot ir- ira irb ird ire iri irk iro irr irs irt is- isa isb isd ise isi isk iso isr iss ist ita itb itd ite iti itk ito its itt k-t ka- kaa kab kad kae kai kak kao kar kas kat kba kbb kbd kbe kbi kbk kbo kbr kbs kda kdb kde kdk kdo kdr kds kdt ke- kea keb ked kee kei kek keo ker kes ket kia kib kid kie kii kik kio kir kis kit kkb kke kki kkk kkr kks kkt koa kob kod koe koi kok koo kor kos kot kra krd kri krk kro krr krs krt ksa ksb ksd kse ksi ksk kso ksr kss kst kta ktb kte ktk kto ktr kts ktt o-i oaa oab oad oae oai oak oao oar oas oat ob- oba obb obd obe obi obk obo obr obs obt oda odb odd ode odi odo odr ods odt oea oeb oed oee oei oeo oer oes oet oia oib oid oie oii oik oio oir ois oit oka okb okd oke oki okk oko okr oks oo- ooa oob ood ooi ook ooo oor oos oot or- ora orb ord ore ori ork oro orr ors ort os- osa osb osd ose osi osk oso osr oss ost ot- ota otb otd ote oti otk oto otr ots ott ra- raa rab rad rae rai rak rao rar ras rat rba rbb rbd rbe rbi rbk rbo rbr rbs rbt rda rdb rdd rde rdi rdo rdr rds rdt re- rea reb red ree rei rek reo rer res ret ria rib rid rie rii rik rio rir ris rit rkb rke rkk rko rks rkt roa rob rod roe roi rok roo ror ros rot rra rrb rrd rri rrk rrr rrs rrt rsa rsb rsd rse rsi rsk rso rsr rss rst rta rtb rtd rte rti rtk rto rtr rts rtt saa sab sad sae sai sak sao sar sas sat sba sbb sbd sbe sbi sbk sbo sbr sbs sbt sda sdb sdd sde sdi sdk sdo sdr sds sdt se- sea seb sed see sei sek seo ser ses set sia sib sid sie sii sik sio sir sis sit sk- ska skb skd ske ski skk sko skr sks skt soa sob sod soe soi sok soo sor sos sot sr- sra srb srd sre sri srk sro srr srs srt ss- ssa ssb ssd sse ssi ssk sso ssr sss sst sta stb std ste sti stk sto str sts stt taa tab tad tae tai tak tao tar tas tat tba tbb tbd tbe tbi tbk tbo tbr tbs tbt tda tdb tdd tde tdi tdk tdo tdr tds tdt te- tea teb ted tee tei tek teo ter tes tet tia tib tid tie tii tik tio tir tis tit tka tkb tke tkk tko tkr tks tkt to- toa tob tod toe toi tok too tor tos tot tra trb trd tre tri trk tro trr trs trt tsa tsb tsd tse tsi tsk tso tsr tss tst tta ttb ttd tte tti ttk