bbb bbd bbe bbk bbn bdb bdd bde bdk be- beb bed bee bek ben bkb bke bkk bkn bnb bnd bne bnk bnn dbb dbd dbe dbk dbn ddb ddd dde ddk ddn de- deb ded dee dek den dkb dke dkk dnb dnd dne dnk dnn ebb ebd ebe ebk ebn ed- edb edd ede edk edn eeb eed eee eek een ekb ekd eke en- enb end ene enk enn kbb kbd kbe kbk kbn kdb kde kdk ke- keb ked kee kek ken kkb kke kkk kkn kn- knd kne knk knn nbb nbd nbe nbk nbn ndb ndd nde ndk ndn ne- neb ned nee nek nen nke nkk nkn nnb nne nnk nnn