bbb bbd bbe bbk bbm bdb bdd bde bdk bdm be- beb bed bee bek bem bkb bke bkk bkm bmb bmd bme bmk bmm dbb dbd dbe dbk dbm ddb ddd dde ddk ddm de- deb ded dee dek dem dkb dke dkk dkm dmb dmd dme dmk dmm ebb ebd ebe ebk ebm ed- edb edd ede edk edm eeb eed eee eek eem ekb ekd eke em- emb emd eme emk emm kbb kbd kbe kbk kbm kdb kde kdk kdm ke- keb ked kee kek kem kkb kke kkk kkm kmb kmd kme kmk kmm mbb mbd mbe mbk mbm mdb mdd mde mdk mdm meb med mee mek mem mkb mkd mke mkk mkm mmb mmd mme mmk mmm