-er -ic a-a a-b a-c a-i a-t aaa aab aac aad aae aai aar aas aat ab- aba abb abc abd abe abi abr abs abt ac- aca acb acc acd ace aci acr acs act ad- ada adb adc add ade adi adr ads adt aea aeb aec aed aee aei aer aes aet ai- aia aib aic aid aie aii air ais ait ar- ara arb arc ard are ari arr ars art as- asa asb asc asd ase asi asr ass ast at- ata atb atc atd ate ati atr ats att baa bab bac bad bae bai bar bas bat bba bbb bbc bbd bbe bbi bbr bbs bbt bca bcb bcc bcd bce bci bcr bcs bct bda bdb bdc bdd bde bdi bdr bds bdt be- bea beb bec bed bee bei ber bes bet bi- bia bib bic bid bie bii bir bis bit bra brb brd bre bri brr brs brt bsa bsb bsc bsd bse bsi bsr bss bst bta btb btc btd bte bti btr bts btt c-- caa cab cac cad cae cai car cas cat cba cbb cbc cbd cbe cbi cbr cbs cbt cca ccb ccc ccd cce cci ccr ccs cct cda cdb cdc cdd cde cdi cdr cds cdt ce- cea ceb cec ced cee cei cer ces cet ci- cia cib cic cid cie cii cir cis cit cra crb crc crd cre cri crr crs crt csa csb csc csd cse csi csr css cst cta ctb ctc ctd cte cti ctr cts ctt daa dab dac dad dae dai dar das dat dba dbb dbc dbd dbe dbi dbr dbs dbt dca dcb dcc dcd dce dci dcr dcs dct dda ddb ddc ddd dde ddi ddr dds ddt de- dea deb dec ded dee dei der des det di- dia dib dic did die dii dir dis dit dra drb drc drd dre dri drr drs drt dsa dsb dsc dsd dse dsi dsr dss dst dta dtb dtc dtd dte dti dtr dts dtt eaa eab eac ead eae eai ear eas eat eba ebb ebc ebd ebe ebi ebr ebs ebt ec- eca ecb ecc ecd ece eci ecr ecs ect ed- eda edb edc edd ede edi edr eds edt eea eeb eec eed eee eer ees eet eia eib eic eid eie eii eir eis eit era erb erc erd ere eri err ers ert es- esa esb esc esd ese esi esr ess est eta etb etc etd ete eti etr ets ett i-d ia- iaa iab iac iad iae iai iar ias iat iba ibb ibc ibd ibe ibi ibr ibs ibt ica icb icc icd ice ici icr ics ict ida idb idc idd ide idi idr ids idt ie- iea iec ied iee iei ier ies iet iia iib iic iid iie iii iir iis iit ir- ira irb irc ird ire iri irr irs irt is- isa isb isc isd ise isi isr iss ist ita itb itc itd ite iti its itt ra- raa rab rac rad rae rai rar ras rat rba rbb rbc rbd rbe rbi rbr rbs rbt rca rcb rcc rcd rce rci rcr rcs rct rda rdb rdc rdd rde rdi rdr rds rdt re- rea reb rec red ree rei rer res ret ria rib ric rid rie rii rir ris rit rra rrb rrc rrd rri rrr rrs rrt rsa rsb rsc rsd rse rsi rsr rss rst rta rtb rtc rtd rte rti rtr rts rtt saa sab sac sad sae sai sar sas sat sba sbb sbc sbd sbe sbi sbr sbs sbt sca scb scc scd sce sci scr scs sct sda sdb sdc sdd sde sdi sdr sds sdt se- sea seb sec sed see sei ser ses set sia sib sic sid sie sii sir sis sit sr- sra srb src srd sre sri srr srs srt ss- ssa ssb ssc ssd sse ssi ssr sss sst sta stb stc std ste sti str sts stt taa tab tac tad tae tai tar tas tat tba tbb tbc tbd tbe tbi tbr tbs tbt tca tcb tcc tcd tce tci tcr tcs tct tda tdb tdc tdd tde tdi tdr tds tdt te- tea teb tec ted tee tei ter tes tet tia tib tic tid tie tii tir tis tit tra trb trc trd tre tri trr trs trt tsa tsb tsc tsd tse tsi tsr tss tst tta ttb ttc ttd tte tti ttr tts ttt