-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aao aar aas aat ab- aba abb abc abe abi abk abo abr abs abt ac- aca acb acc ace aci ack aco acr acs act aea aeb aec aee aei aek aeo aer aes aet ai- aia aib aic aie aii aik aio air ais ait aka akb akc ake aki akk ako akr aks aoa aob aoc aoe aoi aok aoo aor aos aot ar- ara arb arc are ari ark aro arr ars art as- asa asb asc ase asi ask aso asr ass ast at- ata atb atc ate ati ato atr ats att baa bab bac bae bai bak bao bar bas bat bba bbb bbc bbe bbi bbk bbo bbr bbs bbt bca bcb bcc bce bci bck bco bcr bcs bct be- bea beb bec bee bei bek beo ber bes bet bi- bia bib bic bie bii bik bio bir bis bit bka bkb bkc bke bkk bko bkr bks bkt boa bob boc boe boi bok boo bor bos bot bra brb bre bri brk bro brr brs brt bsa bsb bsc bse bsi bsk bso bsr bss bst bta btb btc bte bti btk bto btr bts btt c-- caa cab cac cae cai cak cao car cas cat cba cbb cbc cbe cbi cbk cbo cbr cbs cbt cca ccb ccc cce cci cck cco ccr ccs cct ce- cea ceb cec cee cei cek ceo cer ces cet ci- cia cib cic cie cii cik cio cir cis cit cka ckb ckc cki cko cks ckt co- coa cob coc coe coi cok coo cor cos cot cra crb crc cre cri crk cro crr crs crt csa csb csc cse csi csk cso csr css cst cta ctb ctc cte cti ctk cto ctr cts ctt eaa eab eac eae eai eak eao ear eas eat eba ebb ebc ebe ebi ebk ebo ebr ebs ebt ec- eca ecb ecc ece eci eck eco ecr ecs ect eea eeb eec eee eek eeo eer ees eet eia eib eic eie eii eik eio eir eis eit eka ekb ekc eke eki eko ekr eks ekt eo- eoa eob eoc eoe eoi eok eoo eor eos eot era erb erc ere eri erk ero err ers ert es- esa esb esc ese esi esk eso esr ess est eta etb etc ete eti etk eto etr ets ett ia- iaa iab iac iae iai iao iar ias iat iba ibb ibc ibe ibi ibk ibo ibr ibs ibt ica icb icc ice ici ick ico icr ics ict ie- iea iec iee iei iek ier ies iet iia iib iic iie iii iio iir iis iit ika ikb ikc ike iki ikk iko ikr iks ikt io- ioa iob ioc ioe ioi ioo ior ios iot ir- ira irb irc ire iri irk iro irr irs irt is- isa isb isc ise isi isk iso isr iss ist ita itb itc ite iti itk ito its itt k-t ka- kaa kab kac kae kai kak kao kar kas kat kba kbb kbc kbe kbi kbk kbo kbr kbs kca kcb kcc kce kci kck kcr kcs kct ke- kea keb kec kee kei kek keo ker kes ket kia kib kic kie kii kik kio kir kis kit kkb kkc kke kki kkk kkr kks kkt koa kob koc koe koi kok koo kor kos kot kra krc kri krk kro krr krs krt ksa ksb ksc kse ksi ksk kso ksr kss kst kta ktb ktc kte ktk kto ktr kts ktt o-i oaa oab oac oae oai oak oao oar oas oat ob- oba obb obc obe obi obk obo obr obs obt oc- oca ocb occ oci ock oco ocr ocs oct oea oeb oec oee oei oeo oer oes oet oia oib oic oie oii oik oio oir ois oit oka okb okc oke oki okk oko okr oks oo- ooa oob ooc ooi ook ooo oor oos oot or- ora orb orc ore ori ork oro orr ors ort os- osa osb osc ose osi osk oso osr oss ost ot- ota otb otc ote oti otk oto otr ots ott ra- raa rab rac rae rai rak rao rar ras rat rba rbb rbc rbe rbi rbk rbo rbr rbs rbt rca rcb rcc rce rci rco rcr rcs rct re- rea reb rec ree rei rek reo rer res ret ria rib ric rie rii rik rio rir ris rit rkb rkc rke rkk rko rks rkt roa rob roc roe roi rok roo ror ros rot rra rrb rrc rri rrk rrr rrs rrt rsa rsb rsc rse rsi rsk rso rsr rss rst rta rtb rtc rte rti rtk rto rtr rts rtt saa sab sac sae sai sak sao sar sas sat sba sbb sbc sbe sbi sbk sbo sbr sbs sbt sca scb scc sce sci sck sco scr scs sct se- sea seb sec see sei sek seo ser ses set sia sib sic sie sii sik sio sir sis sit sk- ska skb skc ske ski skk sko skr sks skt soa sob soc soe soi sok soo sor sos sot sr- sra srb src sre sri srk sro srr srs srt ss- ssa ssb ssc sse ssi ssk sso ssr sss sst sta stb stc ste sti stk sto str sts stt taa tab tac tae tai tak tao tar tas tat tba tbb tbc tbe tbi tbk tbo tbr tbs tbt tca tcb tcc tce tci tck tco tcr tcs tct te- tea teb tec tee tei tek teo ter tes tet tia tib tic tie tii tik tio tir tis tit tka tkb tkc tke tkk tko tkr tks tkt to- toa tob toc toe toi tok too tor tos tot tra trb trc tre tri trk tro trr trs trt tsa tsb tsc tse tsi tsk tso tsr