-er a-a aaa aad aae aak aan aar ad- ada add ade adk adn adr aea aed aee aek aen aer aka akd ake akk akn akr an- ana and ane ank ann anr ar- ara ard are ark arn arr daa dad dae dak dan dar dda ddd dde ddk ddn ddr de- dea ded dee dek den der dka dke dkk dkr dna dnd dne dnk dnn dnr dra drd dre drk drn drr eaa ead eae eak ean ear ed- eda edd ede edk edn edr eea eed eee eek een eer eka ekd eke ekr en- ena end ene enk enn enr era erd ere erk ern err ka- kaa kad kae kak kan kar kda kde kdk kdr ke- kea ked kee kek ken ker kke kkk kkn kkr kn- kna knd kne knk knn knr kra krd krk krn krr naa nad nae nak nan nar nda ndd nde ndk ndn ndr ne- nea ned nee nek nen ner nka nke nkk nkn nkr nna nne nnk nnn nra nrd nre nrk nrn nrr ra- raa rad rae rak ran rar rda rdd rde rdn rdr re- rea red ree rek ren rer rke rkk rna rnd rnn rnr rra rrd rrk rrn rrr