a-a a-c a-t aaa aac aad aao aar aat ac- aca acc acd aco acr act ad- ada adc add ado adr adt aoa aoc aod aoo aor aot ar- ara arc ard aro arr art at- ata atc atd ato atr att c-- caa cac cad cao car cat cca ccc ccd cco ccr cct cda cdc cdd cdo cdr cdt co- coa coc cod coo cor cot cra crc crd cro crr crt cta ctc ctd cto ctr ctt daa dac dad dao dar dat dca dcc dcd dco dcr dct dda ddc ddd ddo ddr ddt doa doc dod doo dor dot dra drc drd dro drr drt dta dtc dtd dto dtr dtt oaa oac oad oao oar oat oc- oca occ ocd oco ocr oct oda odc odd odo odr odt oo- ooa ooc ood ooo oor oot or- ora orc ord oro orr ort ot- ota otc otd oto otr ott ra- raa rac rad rao rar rat rca rcc rcd rco rcr rct rda rdc rdd rdo rdr rdt roa roc rod roo ror rot rra rrc rrd rrr rrt rta rtc rtd rto rtr rtt taa tac tad tao tar tat tca tcc tcd tco tcr tct tda tdc tdd tdo tdr tdt to- toa toc tod too tor tot tra trc trd tro trr trt tta ttc ttd tto ttr ttt