a-a a-c a-t aaa aac aap aar aas aat ac- aca acc acp acr acs act ap- apa apc app apr aps apt ar- ara arc arp arr ars art as- asa asc asp asr ass ast at- ata atc atp atr ats att c-- caa cac cap car cas cat cca ccc ccp ccr ccs cct cpa cpc cpp cpr cps cpt cra crc crp crr crs crt csa csc csp csr css cst cta ctc ctp ctr cts ctt p-p paa pac pap par pas pat pca pcc pcp pcr pcs pct ppa ppc ppp ppr pps ppt pra prc prp prr prs prt ps- psa psc psp psr pss pst pt- pta ptc ptp ptr pts ptt ra- raa rac rap rar ras rat rca rcc rcp rcr rcs rct rpa rpc rpp rpr rps rpt rra rrc rrp rrr rrs rrt rsa rsc rsp rsr rss rst rta rtc rtp rtr rts rtt saa sac sap sar sas sat sca scc scp scr scs sct spa spc spp spr sps spt sr- sra src srp srr srs srt ss- ssa ssc ssp ssr sss sst sta stc stp str sts stt taa tac tap tar tas tat tca tcc tcp tcr tcs tct tpa tpc tpp tpr tps tpt tra trc trp trr trs trt tsa tsc tsp tsr tss tst tta ttc ttp ttr tts ttt