a-a a-c a-t aaa aac aaf aap aat ac- aca acc acf acp act af- afa afc aff afp aft ap- apa apc apf app apt at- ata atc atf atp att c-- caa cac caf cap cat cca ccc ccf ccp cct cfa cfc cff cfp cft cpa cpc cpf cpp cpt cta ctc ctf ctp ctt faa fac faf fap fat fca fcc fcf fcp fct ffa ffc fff ffp fft fpa fpc fpp fpt fta ftc ftf ftp ftt p-p paa pac paf pap pat pca pcc pcf pcp pct pfa pfc pff pfp pft ppa ppc ppf ppp ppt pt- pta ptc ptf ptp ptt taa tac taf tap tat tca tcc tcf tcp tct tfa tfc tff tfp tft tpa tpc tpf tpp tpt tta ttc ttf ttp ttt