a-a a-c a-t aaa aac aad aap aas aat ac- aca acc acd acp acs act ad- ada adc add adp ads adt ap- apa apc apd app aps apt as- asa asc asd asp ass ast at- ata atc atd atp ats att c-- caa cac cad cap cas cat cca ccc ccd ccp ccs cct cda cdc cdd cdp cds cdt cpa cpc cpd cpp cps cpt csa csc csd csp css cst cta ctc ctd ctp cts ctt daa dac dad dap das dat dca dcc dcd dcp dcs dct dda ddc ddd ddp dds ddt dpa dpc dpd dpp dps dpt dsa dsc dsd dsp dss dst dta dtc dtd dtp dts dtt p-p paa pac pad pap pas pat pca pcc pcd pcp pcs pct pda pdc pdd pdp pds pdt ppa ppc ppd ppp pps ppt ps- psa psc psd psp pss pst pt- pta ptc ptd ptp pts ptt saa sac sad sap sas sat sca scc scd scp scs sct sda sdc sdd sdp sds sdt spa spc spd spp sps spt ss- ssa ssc ssd ssp sss sst sta stc std stp sts stt taa tac tad tap tas tat tca tcc tcd tcp tcs tct tda tdc tdd tdp tds tdt tpa tpc tpd tpp tps tpt tsa tsc tsd tsp tss tst tta ttc ttd ttp tts ttt