-er a-a a-c a-t aaa aac aae aaf aap aar aat ac- aca acc ace acf acp acr act aea aec aee aef aep aer aet af- afa afc afe aff afp afr aft ap- apa apc ape apf app apr apt ar- ara arc are arf arp arr art at- ata atc ate atf atp atr att c-- caa cac cae caf cap car cat cca ccc cce ccf ccp ccr cct ce- cea cec cee cef cep cer cet cfa cfc cfe cff cfp cfr cft cpa cpc cpe cpf cpp cpr cpt cra crc cre crf crp crr crt cta ctc cte ctf ctp ctr ctt eaa eac eae eaf eap ear eat ec- eca ecc ece ecf ecr ect eea eec eee eef eep eer eet ef- efa efc efe eff efp efr eft ep- epa epc epe epf epp epr ept era erc ere erf erp err ert eta etc ete etf etp etr ett faa fac fae faf fap far fat fca fcc fce fcf fcp fcr fct fea fec fee fef fep fer fet ffa ffc ffe fff ffp ffr fft fpa fpc fpe fpp fpr fpt fra frc fre frf frp frr frt fta ftc fte ftf ftp ftr ftt p-p paa pac pae paf pap par pat pca pcc pce pcf pcp pcr pct pea pec pee pef pep per pet pfa pfc pfe pff pfp pfr pft ppa ppc ppe ppf ppp ppr ppt pra prc pre prf prp prr prt pt- pta ptc pte ptf ptp ptr ptt ra- raa rac rae raf rap rar rat rca rcc rce rcf rcp rcr rct re- rea rec ree ref rep rer ret rfa rfc rfe rff rfp rfr rft rpa rpc rpe rpf rpp rpr rpt rra rrc rrf rrp rrr rrt rta rtc rte rtf rtp rtr rtt taa tac tae taf tap tar tat tca tcc tce tcf tcp tcr tct te- tea tec tee tef tep ter tet tfa tfc tfe tff tfp tfr tft tpa tpc tpe tpf tpp tpr tpt tra trc tre trf trp trr trt tta ttc tte ttf ttp ttr ttt