a-a a-c a-t aaa aac aap aas aat ac- aca acc acp acs act ap- apa apc app aps apt as- asa asc asp ass ast at- ata atc atp ats att c-- caa cac cap cas cat cca ccc ccp ccs cct cpa cpc cpp cps cpt csa csc csp css cst cta ctc ctp cts ctt p-p paa pac pap pas pat pca pcc pcp pcs pct ppa ppc ppp pps ppt ps- psa psc psp pss pst pt- pta ptc ptp pts ptt saa sac sap sas sat sca scc scp scs sct spa spc spp sps spt ss- ssa ssc ssp sss sst sta stc stp sts stt taa tac tap tas tat tca tcc tcp tcs tct tpa tpc tpp tps tpt tsa tsc tsp tss tst tta ttc ttp tts ttt