-er a-a a-c a-t aaa aac aad aae aak aar aat ac- aca acc acd ace ack acr act ad- ada adc add ade adk adr adt aea aec aed aee aek aer aet aka akc akd ake akk akr ar- ara arc ard are ark arr art at- ata atc atd ate atr att c-- caa cac cad cae cak car cat cca ccc ccd cce cck ccr cct cda cdc cdd cde cdk cdr cdt ce- cea cec ced cee cek cer cet cka ckc ckd ckt cra crc crd cre crk crr crt cta ctc ctd cte ctk ctr ctt daa dac dad dae dak dar dat dca dcc dcd dce dck dcr dct dda ddc ddd dde ddk ddr ddt de- dea dec ded dee dek der det dka dkc dke dkk dkr dkt dra drc drd dre drk drr drt dta dtc dtd dte dtk dtr dtt eaa eac ead eae eak ear eat ec- eca ecc ecd ece eck ecr ect ed- eda edc edd ede edk edr edt eea eec eed eee eek eer eet eka ekc ekd eke ekr ekt era erc erd ere erk err ert eta etc etd ete etk etr ett k-t ka- kaa kac kad kae kak kar kat kca kcc kcd kce kck kcr kct kda kdc kde kdk kdr kdt ke- kea kec ked kee kek ker ket kkc kke kkk kkr kkt kra krc krd krk krr krt kta ktc kte ktk ktr ktt ra- raa rac rad rae rak rar rat rca rcc rcd rce rcr rct rda rdc rdd rde rdr rdt re- rea rec red ree rek rer ret rkc rke rkk rkt rra rrc rrd rrk rrr rrt rta rtc rtd rte rtk rtr rtt taa tac tad tae tak tar tat tca tcc tcd tce tck tcr tct tda tdc tdd tde tdk tdr tdt te- tea tec ted tee tek ter tet tka tkc tke tkk tkr tkt tra trc trd tre trk trr trt tta ttc ttd tte ttk ttr ttt