a-a a-c a-t aaa aac aao aap aar aas aat ac- aca acc aco acp acr acs act aoa aoc aoo aop aor aos aot ap- apa apc apo app apr aps apt ar- ara arc aro arp arr ars art as- asa asc aso asp asr ass ast at- ata atc ato atp atr ats att c-- caa cac cao cap car cas cat cca ccc cco ccp ccr ccs cct co- coa coc coo cop cor cos cot cpa cpc cpo cpp cpr cps cpt cra crc cro crp crr crs crt csa csc cso csp csr css cst cta ctc cto ctp ctr cts ctt oaa oac oao oap oar oas oat oc- oca occ oco ocp ocr ocs oct oo- ooa ooc ooo oop oor oos oot op- opa opc opo opp opr ops opt or- ora orc oro orp orr ors ort os- osa osc oso osp osr oss ost ot- ota otc oto otp otr ots ott p-p paa pac pao pap par pas pat pca pcc pco pcp pcr pcs pct poa poc poo pop por pos pot ppa ppc ppo ppp ppr pps ppt pra prc pro prp prr prs prt ps- psa psc pso psp psr pss pst pt- pta ptc pto ptp ptr pts ptt ra- raa rac rao rap rar ras rat rca rcc rco rcp rcr rcs rct roa roc roo rop ror ros rot rpa rpc rpo rpp rpr rps rpt rra rrc rrp rrr rrs rrt rsa rsc rso rsp rsr rss rst rta rtc rto rtp rtr rts rtt saa sac sao sap sar sas sat sca scc sco scp scr scs sct soa soc soo sop sor sos sot spa spc spo spp spr sps spt sr- sra src sro srp srr srs srt ss- ssa ssc sso ssp ssr sss sst sta stc sto stp str sts stt taa tac tao tap tar tas tat tca tcc tco tcp tcr tcs tct to- toa toc too top tor tos tot tpa tpc tpo tpp tpr tps tpt tra trc tro trp trr trs trt tsa tsc tso tsp tsr tss tst tta ttc tto ttp ttr tts ttt