a-a a-c a-t aaa aac aad aao aas aat ac- aca acc acd aco acs act ad- ada adc add ado ads adt aoa aoc aod aoo aos aot as- asa asc asd aso ass ast at- ata atc atd ato ats att c-- caa cac cad cao cas cat cca ccc ccd cco ccs cct cda cdc cdd cdo cds cdt co- coa coc cod coo cos cot csa csc csd cso css cst cta ctc ctd cto cts ctt daa dac dad dao das dat dca dcc dcd dco dcs dct dda ddc ddd ddo dds ddt doa doc dod doo dos dot dsa dsc dsd dso dss dst dta dtc dtd dto dts dtt oaa oac oad oao oas oat oc- oca occ ocd oco ocs oct oda odc odd odo ods odt oo- ooa ooc ood ooo oos oot os- osa osc osd oso oss ost ot- ota otc otd oto ots ott saa sac sad sao sas sat sca scc scd sco scs sct sda sdc sdd sdo sds sdt soa soc sod soo sos sot ss- ssa ssc ssd sso sss sst sta stc std sto sts stt taa tac tad tao tas tat tca tcc tcd tco tcs tct tda tdc tdd tdo tds tdt to- toa toc tod too tos tot tsa tsc tsd tso tss tst tta ttc ttd tto tts ttt