-er a-a a-c a-t aaa aac aad aae aak aan aar aat ac- aca acc acd ace ack acn acr act ad- ada adc add ade adk adn adr adt aea aec aed aee aek aen aer aet aka akc akd ake akk akn akr an- ana anc and ane ank ann anr ant ar- ara arc ard are ark arn arr art at- ata atc atd ate atn atr att c-- caa cac cad cae cak can car cat cca ccc ccd cce cck ccn ccr cct cda cdc cdd cde cdk cdn cdr cdt ce- cea cec ced cee cek cen cer cet cka ckc ckd ckt cn- cna cnc cnd cne cnn cnr cnt cra crc crd cre crk crn crr crt cta ctc ctd cte ctk ctn ctr ctt daa dac dad dae dak dan dar dat dca dcc dcd dce dck dcn dcr dct dda ddc ddd dde ddk ddn ddr ddt de- dea dec ded dee dek den der det dka dkc dke dkk dkr dkt dna dnc dnd dne dnk dnn dnr dnt dra drc drd dre drk drn drr drt dta dtc dtd dte dtk dtn dtr dtt eaa eac ead eae eak ean ear eat ec- eca ecc ecd ece eck ecn ecr ect ed- eda edc edd ede edk edn edr edt eea eec eed eee eek een eer eet eka ekc ekd eke ekr ekt en- ena enc end ene enk enn enr ent era erc erd ere erk ern err ert eta etc etd ete etk etn etr ett k-t ka- kaa kac kad kae kak kan kar kat kca kcc kcd kce kck kcn kcr kct kda kdc kde kdk kdr kdt ke- kea kec ked kee kek ken ker ket kkc kke kkk kkn kkr kkt kn- kna knc knd kne knk knn knr knt kra krc krd krk krn krr krt kta ktc kte ktk ktn ktr ktt naa nac nad nae nak nan nar nat nca ncc ncd nce nck ncn ncr nct nda ndc ndd nde ndk ndn ndr ndt ne- nea nec ned nee nek nen ner net nka nkc nke nkk nkn nkr nkt nna nnc nne nnk nnn nnt nra nrc nrd nre nrk nrn nrr nrt nta ntc ntd nte ntk ntn ntr ntt ra- raa rac rad rae rak ran rar rat rca rcc rcd rce rcn rcr rct rda rdc rdd rde rdn rdr rdt re- rea rec red ree rek ren rer ret rkc rke rkk rkt rna rnc rnd rnn rnr rnt rra rrc rrd rrk rrn rrr rrt rta rtc rtd rte rtk rtn rtr rtt taa tac tad tae tak tan tar tat tca tcc tcd tce tck tcn tcr tct tda tdc tdd tde tdk tdn tdr tdt te- tea tec ted tee tek ten ter tet tka tkc tke tkk tkr tkt tna tnc tnd tne tnk tnn tnr tnt tra trc trd tre trk trn trr trt tta ttc ttd tte ttk ttn ttr ttt