-er -ic a-a a-b a-c a-i a-t aaa aab aac aad aae aai aao aar aas aat ab- aba abb abc abd abe abi abo abr abs abt ac- aca acb acc acd ace aci aco acr acs act ad- ada adb adc add ade adi ado adr ads adt aea aeb aec aed aee aei aeo aer aes aet ai- aia aib aic aid aie aii aio air ais ait aoa aob aoc aod aoe aoi aoo aor aos aot ar- ara arb arc ard are ari aro arr ars art as- asa asb asc asd ase asi aso asr ass ast at- ata atb atc atd ate ati ato atr ats att baa bab bac bad bae bai bao bar bas bat bba bbb bbc bbd bbe bbi bbo bbr bbs bbt bca bcb bcc bcd bce bci bco bcr bcs bct bda bdb bdc bdd bde bdi bdo bdr bds bdt be- bea beb bec bed bee bei beo ber bes bet bi- bia bib bic bid bie bii bio bir bis bit boa bob boc bod boe boi boo bor bos bot bra brb brd bre bri bro brr brs brt bsa bsb bsc bsd bse bsi bso bsr bss bst bta btb btc btd bte bti bto btr bts btt c-- caa cab cac cad cae cai cao car cas cat cba cbb cbc cbd cbe cbi cbo cbr cbs cbt cca ccb ccc ccd cce cci cco ccr ccs cct cda cdb cdc cdd cde cdi cdo cdr cds cdt ce- cea ceb cec ced cee cei ceo cer ces cet ci- cia cib cic cid cie cii cio cir cis cit co- coa cob coc cod coe coi coo cor cos cot cra crb crc crd cre cri cro crr crs crt csa csb csc csd cse csi cso csr css cst cta ctb ctc ctd cte cti cto ctr cts ctt daa dab dac dad dae dai dao dar das dat dba dbb dbc dbd dbe dbi dbo dbr dbs dbt dca dcb dcc dcd dce dci dco dcr dcs dct dda ddb ddc ddd dde ddi ddo ddr dds ddt de- dea deb dec ded dee dei deo der des det di- dia dib dic did die dii dio dir dis dit doa dob doc dod doe doi doo dor dos dot dra drb drc drd dre dri dro drr drs drt dsa dsb dsc dsd dse dsi dso dsr dss dst dta dtb dtc dtd dte dti dto dtr dts dtt eaa eab eac ead eae eai eao ear eas eat eba ebb ebc ebd ebe ebi ebo ebr ebs ebt ec- eca ecb ecc ecd ece eci eco ecr ecs ect ed- eda edb edc edd ede edi edo edr eds edt eea eeb eec eed eee eeo eer ees eet eia eib eic eid eie eii eio eir eis eit eo- eoa eob eoc eod eoe eoi eoo eor eos eot era erb erc erd ere eri ero err ers ert es- esa esb esc esd ese esi eso esr ess est eta etb etc etd ete eti eto etr ets ett i-d ia- iaa iab iac iad iae iai iao iar ias iat iba ibb ibc ibd ibe ibi ibo ibr ibs ibt ica icb icc icd ice ici ico icr ics ict ida idb idc idd ide idi ido idr ids idt ie- iea iec ied iee iei ier ies iet iia iib iic iid iie iii iio iir iis iit io- ioa iob ioc iod ioe ioi ioo ior ios iot ir- ira irb irc ird ire iri iro irr irs irt is- isa isb isc isd ise isi iso isr iss ist ita itb itc itd ite iti ito its itt o-i oaa oab oac oad oae oai oao oar oas oat ob- oba obb obc obd obe obi obo obr obs obt oc- oca ocb occ ocd oci oco ocr ocs oct oda odb odc odd ode odi odo odr ods odt oea oeb oec oed oee oei oeo oer oes oet oia oib oic oid oie oii oio oir ois oit oo- ooa oob ooc ood ooi ooo oor oos oot or- ora orb orc ord ore ori oro orr ors ort os- osa osb osc osd ose osi oso osr oss ost ot- ota otb otc otd ote oti oto otr ots ott ra- raa rab rac rad rae rai rao rar ras rat rba rbb rbc rbd rbe rbi rbo rbr rbs rbt rca rcb rcc rcd rce rci rco rcr rcs rct rda rdb rdc rdd rde rdi rdo rdr rds rdt re- rea reb rec red ree rei reo rer res ret ria rib ric rid rie rii rio rir ris rit roa rob roc rod roe roi roo ror ros rot rra rrb rrc rrd rri rrr rrs rrt rsa rsb rsc rsd rse rsi rso rsr rss rst rta rtb rtc rtd rte rti rto rtr rts rtt saa sab sac sad sae sai sao sar sas sat sba sbb sbc sbd sbe sbi sbo sbr sbs sbt sca scb scc scd sce sci sco scr scs sct sda sdb sdc sdd sde sdi sdo sdr sds sdt se- sea seb sec sed see sei seo ser ses set sia sib sic sid sie sii sio sir sis sit soa sob soc sod soe soi soo sor sos sot sr- sra srb src srd sre sri sro srr srs srt ss- ssa ssb ssc ssd sse ssi sso ssr sss sst sta stb stc std ste sti sto str sts stt taa tab tac tad tae tai tao tar tas tat tba tbb tbc tbd tbe tbi tbo tbr tbs tbt tca tcb tcc tcd tce tci tco tcr tcs tct tda tdb tdc tdd tde tdi tdo tdr tds tdt te- tea teb tec ted tee tei teo ter tes tet tia tib tic tid tie tii tio tir tis tit to- toa tob toc