a-a a-c a-t aaa aac aap aar aat ac- aca acc acp acr act ap- apa apc app apr apt ar- ara arc arp arr art at- ata atc atp atr att c-- caa cac cap car cat cca ccc ccp ccr cct cpa cpc cpp cpr cpt cra crc crp crr crt cta ctc ctp ctr ctt p-p paa pac pap par pat pca pcc pcp pcr pct ppa ppc ppp ppr ppt pra prc prp prr prt pt- pta ptc ptp ptr ptt ra- raa rac rap rar rat rca rcc rcp rcr rct rpa rpc rpp rpr rpt rra rrc rrp rrr rrt rta rtc rtp rtr rtt taa tac tap tar tat tca tcc tcp tcr tct tpa tpc tpp tpr tpt tra trc trp trr trt tta ttc ttp ttr ttt