-er a-a a-c a-t aaa aac aae aak aan aar aat ac- aca acc ace ack acn acr act aea aec aee aek aen aer aet aka akc ake akk akn akr an- ana anc ane ank ann anr ant ar- ara arc are ark arn arr art at- ata atc ate atn atr att c-- caa cac cae cak can car cat cca ccc cce cck ccn ccr cct ce- cea cec cee cek cen cer cet cka ckc ckt cn- cna cnc cne cnn cnr cnt cra crc cre crk crn crr crt cta ctc cte ctk ctn ctr ctt eaa eac eae eak ean ear eat ec- eca ecc ece eck ecn ecr ect eea eec eee eek een eer eet eka ekc eke ekr ekt en- ena enc ene enk enn enr ent era erc ere erk ern err ert eta etc ete etk etn etr ett k-t ka- kaa kac kae kak kan kar kat kca kcc kce kck kcn kcr kct ke- kea kec kee kek ken ker ket kkc kke kkk kkn kkr kkt kn- kna knc kne knk knn knr knt kra krc krk krn krr krt kta ktc kte ktk ktn ktr ktt naa nac nae nak nan nar nat nca ncc nce nck ncn ncr nct ne- nea nec nee nek nen ner net nka nkc nke nkk nkn nkr nkt nna nnc nne nnk nnn nnt nra nrc nre nrk nrn nrr nrt nta ntc nte ntk ntn ntr ntt ra- raa rac rae rak ran rar rat rca rcc rce rcn rcr rct re- rea rec ree rek ren rer ret rkc rke rkk rkt rna rnc rnn rnr rnt rra rrc rrk rrn rrr rrt rta rtc rte rtk rtn rtr rtt taa tac tae tak tan tar tat tca tcc tce tck tcn tcr tct te- tea tec tee tek ten ter tet tka tkc tke tkk tkr tkt tna tnc tne tnk tnn tnr tnt tra trc tre trk trn trr trt tta ttc tte ttk ttn ttr ttt