bbb bbd bbe bbf bbk bbs bbx bdb bdd bde bdf bdk bds bdx be- beb bed bee bef bek bes bex bfb bfd bfe bff bfs bfx bkb bke bkf bkk bks bkx bsb bsd bse bsf bsk bss bsx bxb bxd bxx dbb dbd dbe dbf dbk dbs dbx ddb ddd dde ddf ddk dds ddx de- deb ded dee def dek des dex dfb dfd dfe dff dfk dfs dfx dkb dke dkk dks dkx dsb dsd dse dsf dsk dss dsx dxd dxs dxx ebb ebd ebe ebf ebk ebs ebx ed- edb edd ede edf edk eds edx eeb eed eee eef eek ees eex ef- efb efd efe eff efs efx ekb ekd eke ekf eks es- esb esd ese esf esk ess esx ex- exd exe exs exx fbb fbd fbe fbf fbk fbs fbx fdb fdd fde fdf fdk fds fdx feb fed fee fef fek fes fex ffd ffe fff ffk ffs ffx fkb fkf fkk fsb fsd fse fsf fsk fss fsx fxe fxs fxx kbb kbd kbe kbf kbk kbs kbx kdb kde kdf kdk kds kdx ke- keb ked kee kef kek kes kex kfd kff kfs kfx kkb kke kkk kks ksb ksd kse ksf ksk kss sbb sbd sbe sbf sbk sbs sbx sdb sdd sde sdf sdk sds se- seb sed see sef sek ses sex sfb sfd sfe sff sfk sfs sfx sk- skb skd ske skf skk sks skx ss- ssb ssd sse ssf ssk sss ssx sxs xbe xbx xdb xde xdf xdk xds xed xee xes xex xfe xfs xfx xkb xke xks xsb xss xxx