-er a-a a-c a-t aaa aac aad aae aap aar aat ac- aca acc acd ace acp acr act ad- ada adc add ade adp adr adt aea aec aed aee aep aer aet ap- apa apc apd ape app apr apt ar- ara arc ard are arp arr art at- ata atc atd ate atp atr att c-- caa cac cad cae cap car cat cca ccc ccd cce ccp ccr cct cda cdc cdd cde cdp cdr cdt ce- cea cec ced cee cep cer cet cpa cpc cpd cpe cpp cpr cpt cra crc crd cre crp crr crt cta ctc ctd cte ctp ctr ctt daa dac dad dae dap dar dat dca dcc dcd dce dcp dcr dct dda ddc ddd dde ddp ddr ddt de- dea dec ded dee dep der det dpa dpc dpd dpe dpp dpr dpt dra drc drd dre drp drr drt dta dtc dtd dte dtp dtr dtt eaa eac ead eae eap ear eat ec- eca ecc ecd ece ecr ect ed- eda edc edd ede edp edr edt eea eec eed eee eep eer eet ep- epa epc epd epe epp epr ept era erc erd ere erp err ert eta etc etd ete etp etr ett p-p paa pac pad pae pap par pat pca pcc pcd pce pcp pcr pct pda pdc pdd pde pdp pdr pdt pea pec ped pee pep per pet ppa ppc ppd ppe ppp ppr ppt pra prc prd pre prp prr prt pt- pta ptc ptd pte ptp ptr ptt ra- raa rac rad rae rap rar rat rca rcc rcd rce rcp rcr rct rda rdc rdd rde rdp rdr rdt re- rea rec red ree rep rer ret rpa rpc rpd rpe rpp rpr rpt rra rrc rrd rrp rrr rrt rta rtc rtd rte rtp rtr rtt taa tac tad tae tap tar tat tca tcc tcd tce tcp tcr tct tda tdc tdd tde tdp tdr tdt te- tea tec ted tee tep ter tet tpa tpc tpd tpe tpp tpr tpt tra trc trd tre trp trr trt tta ttc ttd tte ttp ttr ttt