-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aar aas aat ab- aba abb abc abe abi abo abr abs abt ac- aca acb acc ace aci aco acr acs act aea aeb aec aee aei aeo aer aes aet ai- aia aib aic aie aii aio air ais ait aoa aob aoc aoe aoi aoo aor aos aot ar- ara arb arc are ari aro arr ars art as- asa asb asc ase asi aso asr ass ast at- ata atb atc ate ati ato atr ats att baa bab bac bae bai bao bar bas bat bba bbb bbc bbe bbi bbo bbr bbs bbt bca bcb bcc bce bci bco bcr bcs bct be- bea beb bec bee bei beo ber bes bet bi- bia bib bic bie bii bio bir bis bit boa bob boc boe boi boo bor bos bot bra brb bre bri bro brr brs brt bsa bsb bsc bse bsi bso bsr bss bst bta btb btc bte bti bto btr bts btt c-- caa cab cac cae cai cao car cas cat cba cbb cbc cbe cbi cbo cbr cbs cbt cca ccb ccc cce cci cco ccr ccs cct ce- cea ceb cec cee cei ceo cer ces cet ci- cia cib cic cie cii cio cir cis cit co- coa cob coc coe coi coo cor cos cot cra crb crc cre cri cro crr crs crt csa csb csc cse csi cso csr css cst cta ctb ctc cte cti cto ctr cts ctt eaa eab eac eae eai eao ear eas eat eba ebb ebc ebe ebi ebo ebr ebs ebt ec- eca ecb ecc ece eci eco ecr ecs ect eea eeb eec eee eeo eer ees eet eia eib eic eie eii eio eir eis eit eo- eoa eob eoc eoe eoi eoo eor eos eot era erb erc ere eri ero err ers ert es- esa esb esc ese esi eso esr ess est eta etb etc ete eti eto etr ets ett ia- iaa iab iac iae iai iao iar ias iat iba ibb ibc ibe ibi ibo ibr ibs ibt ica icb icc ice ici ico icr ics ict ie- iea iec iee iei ier ies iet iia iib iic iie iii iio iir iis iit io- ioa iob ioc ioe ioi ioo ior ios iot ir- ira irb irc ire iri iro irr irs irt is- isa isb isc ise isi iso isr iss ist ita itb itc ite iti ito its itt o-i oaa oab oac oae oai oao oar oas oat ob- oba obb obc obe obi obo obr obs obt oc- oca ocb occ oci oco ocr ocs oct oea oeb oec oee oei oeo oer oes oet oia oib oic oie oii oio oir ois oit oo- ooa oob ooc ooi ooo oor oos oot or- ora orb orc ore ori oro orr ors ort os- osa osb osc ose osi oso osr oss ost ot- ota otb otc ote oti oto otr ots ott ra- raa rab rac rae rai rao rar ras rat rba rbb rbc rbe rbi rbo rbr rbs rbt rca rcb rcc rce rci rco rcr rcs rct re- rea reb rec ree rei reo rer res ret ria rib ric rie rii rio rir ris rit roa rob roc roe roi roo ror ros rot rra rrb rrc rri rrr rrs rrt rsa rsb rsc rse rsi rso rsr rss rst rta rtb rtc rte rti rto rtr rts rtt saa sab sac sae sai sao sar sas sat sba sbb sbc sbe sbi sbo sbr sbs sbt sca scb scc sce sci sco scr scs sct se- sea seb sec see sei seo ser ses set sia sib sic sie sii sio sir sis sit soa sob soc soe soi soo sor sos sot sr- sra srb src sre sri sro srr srs srt ss- ssa ssb ssc sse ssi sso ssr sss sst sta stb stc ste sti sto str sts stt taa tab tac tae tai tao tar tas tat tba tbb tbc tbe tbi tbo tbr tbs tbt tca tcb tcc tce tci tco tcr tcs tct te- tea teb tec tee tei teo ter tes tet tia tib tic tie tii tio tir tis tit to- toa tob toc toe toi too tor tos tot tra trb trc tre tri tro trr trs trt tsa tsb tsc tse tsi tso tsr tss tst tta ttb ttc tte tti tto ttr tts ttt