-er a-a a-c aaa aac aad aae aak aan aar ac- aca acc acd ace ack acn acr ad- ada adc add ade adk adn adr aea aec aed aee aek aen aer aka akc akd ake akk akn akr an- ana anc and ane ank ann anr ar- ara arc ard are ark arn arr c-- caa cac cad cae cak can car cca ccc ccd cce cck ccn ccr cda cdc cdd cde cdk cdn cdr ce- cea cec ced cee cek cen cer cka ckc ckd cn- cna cnc cnd cne cnn cnr cra crc crd cre crk crn crr daa dac dad dae dak dan dar dca dcc dcd dce dck dcn dcr dda ddc ddd dde ddk ddn ddr de- dea dec ded dee dek den der dka dkc dke dkk dkr dna dnc dnd dne dnk dnn dnr dra drc drd dre drk drn drr eaa eac ead eae eak ean ear ec- eca ecc ecd ece eck ecn ecr ed- eda edc edd ede edk edn edr eea eec eed eee eek een eer eka ekc ekd eke ekr en- ena enc end ene enk enn enr era erc erd ere erk ern err ka- kaa kac kad kae kak kan kar kca kcc kcd kce kck kcn kcr kda kdc kde kdk kdr ke- kea kec ked kee kek ken ker kkc kke kkk kkn kkr kn- kna knc knd kne knk knn knr kra krc krd krk krn krr naa nac nad nae nak nan nar nca ncc ncd nce nck ncn ncr nda ndc ndd nde ndk ndn ndr ne- nea nec ned nee nek nen ner nka nkc nke nkk nkn nkr nna nnc nne nnk nnn nra nrc nrd nre nrk nrn nrr ra- raa rac rad rae rak ran rar rca rcc rcd rce rcn rcr rda rdc rdd rde rdn rdr re- rea rec red ree rek ren rer rkc rke rkk rna rnc rnd rnn rnr rra rrc rrd rrk rrn rrr