-er a-a a-c a-t aaa aac aad aae aao aar aat ac- aca acc acd ace aco acr act ad- ada adc add ade ado adr adt aea aec aed aee aeo aer aet aoa aoc aod aoe aoo aor aot ar- ara arc ard are aro arr art at- ata atc atd ate ato atr att c-- caa cac cad cae cao car cat cca ccc ccd cce cco ccr cct cda cdc cdd cde cdo cdr cdt ce- cea cec ced cee ceo cer cet co- coa coc cod coe coo cor cot cra crc crd cre cro crr crt cta ctc ctd cte cto ctr ctt daa dac dad dae dao dar dat dca dcc dcd dce dco dcr dct dda ddc ddd dde ddo ddr ddt de- dea dec ded dee deo der det doa doc dod doe doo dor dot dra drc drd dre dro drr drt dta dtc dtd dte dto dtr dtt eaa eac ead eae eao ear eat ec- eca ecc ecd ece eco ecr ect ed- eda edc edd ede edo edr edt eea eec eed eee eeo eer eet eo- eoa eoc eod eoe eoo eor eot era erc erd ere ero err ert eta etc etd ete eto etr ett oaa oac oad oae oao oar oat oc- oca occ ocd oco ocr oct oda odc odd ode odo odr odt oea oec oed oee oeo oer oet oo- ooa ooc ood ooo oor oot or- ora orc ord ore oro orr ort ot- ota otc otd ote oto otr ott ra- raa rac rad rae rao rar rat rca rcc rcd rce rco rcr rct rda rdc rdd rde rdo rdr rdt re- rea rec red ree reo rer ret roa roc rod roe roo ror rot rra rrc rrd rrr rrt rta rtc rtd rte rto rtr rtt taa tac tad tae tao tar tat tca tcc tcd tce tco tcr tct tda tdc tdd tde tdo tdr tdt te- tea tec ted tee teo ter tet to- toa toc tod toe too tor tot tra trc trd tre tro trr trt tta ttc ttd tte tto ttr ttt