a-a a-c a-t aaa aac aad aao aap aas aat ac- aca acc acd aco acp acs act ad- ada adc add ado adp ads adt aoa aoc aod aoo aop aos aot ap- apa apc apd apo app aps apt as- asa asc asd aso asp ass ast at- ata atc atd ato atp ats att c-- caa cac cad cao cap cas cat cca ccc ccd cco ccp ccs cct cda cdc cdd cdo cdp cds cdt co- coa coc cod coo cop cos cot cpa cpc cpd cpo cpp cps cpt csa csc csd cso csp css cst cta ctc ctd cto ctp cts ctt daa dac dad dao dap das dat dca dcc dcd dco dcp dcs dct dda ddc ddd ddo ddp dds ddt doa doc dod doo dop dos dot dpa dpc dpd dpo dpp dps dpt dsa dsc dsd dso dsp dss dst dta dtc dtd dto dtp dts dtt oaa oac oad oao oap oas oat oc- oca occ ocd oco ocp ocs oct oda odc odd odo odp ods odt oo- ooa ooc ood ooo oop oos oot op- opa opc opd opo opp ops opt os- osa osc osd oso osp oss ost ot- ota otc otd oto otp ots ott p-p paa pac pad pao pap pas pat pca pcc pcd pco pcp pcs pct pda pdc pdd pdo pdp pds pdt poa poc pod poo pop pos pot ppa ppc ppd ppo ppp pps ppt ps- psa psc psd pso psp pss pst pt- pta ptc ptd pto ptp pts ptt saa sac sad sao sap sas sat sca scc scd sco scp scs sct sda sdc sdd sdo sdp sds sdt soa soc sod soo sop sos sot spa spc spd spo spp sps spt ss- ssa ssc ssd sso ssp sss sst sta stc std sto stp sts stt taa tac tad tao tap tas tat tca tcc tcd tco tcp tcs tct tda tdc tdd tdo tdp tds tdt to- toa toc tod too top tos tot tpa tpc tpd tpo tpp tps tpt tsa tsc tsd tso tsp tss tst tta ttc ttd tto ttp tts ttt