bbb bbd bbe bbf bbk bbo bbs bdb bdd bde bdf bdk bdo bds be- beb bed bee bef bek beo bes bfb bfd bfe bff bfo bfs bkb bke bkf bkk bko bks bob bod boe bof bok boo bos bsb bsd bse bsf bsk bso bss dbb dbd dbe dbf dbk dbo dbs ddb ddd dde ddf ddk ddo dds de- deb ded dee def dek deo des dfb dfd dfe dff dfk dfo dfs dkb dke dkk dko dks dob dod doe dof dok doo dos dsb dsd dse dsf dsk dso dss ebb ebd ebe ebf ebk ebo ebs ed- edb edd ede edf edk edo eds eeb eed eee eef eek eeo ees ef- efb efd efe eff efo efs ekb ekd eke ekf eko eks eo- eob eod eoe eof eok eoo eos es- esb esd ese esf esk eso ess fbb fbd fbe fbf fbk fbo fbs fdb fdd fde fdf fdk fdo fds feb fed fee fef fek feo fes ffd ffe fff ffk ffo ffs fkb fkf fkk fob foe fof fok foo fos fsb fsd fse fsf fsk fso fss kbb kbd kbe kbf kbk kbo kbs kdb kde kdf kdk kdo kds ke- keb ked kee kef kek keo kes kfd kff kfo kfs kkb kke kkk kks kob kod koe kof kok koo kos ksb ksd kse ksf ksk kso kss ob- obb obd obe obf obk obo obs odb odd ode odf odo ods oeb oed oee oef oeo oes of- ofb ofd ofe off ofo ofs okb okd oke okk oko oks oo- oob ood oof ook ooo oos os- osb osd ose osf osk oso oss sbb sbd sbe sbf sbk sbo sbs sdb sdd sde sdf sdk sdo sds se- seb sed see sef sek seo ses sfb sfd sfe sff sfk sfo sfs sk- skb skd ske skf skk sko sks sob sod soe sof sok soo sos ss- ssb ssd sse ssf ssk sso sss