bbb bbd bbe bbk bbo bbs bdb bdd bde bdk bdo bds be- beb bed bee bek beo bes bkb bke bkk bko bks bob bod boe bok boo bos bsb bsd bse bsk bso bss dbb dbd dbe dbk dbo dbs ddb ddd dde ddk ddo dds de- deb ded dee dek deo des dkb dke dkk dko dks dob dod doe dok doo dos dsb dsd dse dsk dso dss ebb ebd ebe ebk ebo ebs ed- edb edd ede edk edo eds eeb eed eee eek eeo ees ekb ekd eke eko eks eo- eob eod eoe eok eoo eos es- esb esd ese esk eso ess kbb kbd kbe kbk kbo kbs kdb kde kdk kdo kds ke- keb ked kee kek keo kes kkb kke kkk kks kob kod koe kok koo kos ksb ksd kse ksk kso kss ob- obb obd obe obk obo obs odb odd ode odo ods oeb oed oee oeo oes okb okd oke okk oko oks oo- oob ood ook ooo oos os- osb osd ose osk oso oss sbb sbd sbe sbk sbo sbs sdb sdd sde sdk sdo sds se- seb sed see sek seo ses sk- skb skd ske skk sko sks sob sod soe sok soo sos ss- ssb ssd sse ssk sso sss