-er bbb bbe bbh bbk bbo bbr bbs be- beb bee beh bek beo ber bes bhb bhe bhh bhk bho bhr bhs bkb bke bkk bko bkr bks bob boe boh bok boo bor bos brb bre brh brk bro brr brs bsb bse bsh bsk bso bsr bss ebb ebe ebh ebk ebo ebr ebs eeb eee eek eeo eer ees ehb ehe ehh eho ehr ehs ekb eke ekh eko ekr eks eo- eob eoe eoh eok eoo eor eos erb ere erh erk ero err ers es- esb ese esh esk eso esr ess hbb hbe hbh hbk hbo hbr hbs he- heb hee heh hek heo her hes hhb hhe hhh hhk hho hhr hhs hkb hkh hkk hko hkr hks hob hoe hoh hok hoo hor hos hr- hrb hre hrh hrk hro hrr hrs hsb hse hsh hsk hsr hss kbb kbe kbh kbk kbo kbr kbs ke- keb kee keh kek keo ker kes khe khh khk kho khr khs kkb kke kkh kkk kkr kks kob koe koh kok koo kor kos krk kro krr krs ksb kse ksh ksk kso ksr kss ob- obb obe obh obk obo obr obs oeb oee oeh oeo oer oes ohe ohh oho ohr ohs okb oke okk oko okr oks oo- oob ooh ook ooo oor oos or- orb ore orh ork oro orr ors os- osb ose osh osk oso osr oss rbb rbe rbh rbk rbo rbr rbs re- reb ree reh rek reo rer res rh- rhb rhe rhh rho rhr rhs rkb rke rkk rko rks rob roe roh rok roo ror ros rrb rrh rrk rrr rrs rsb rse rsh rsk rso rsr rss sbb sbe sbh sbk sbo sbr sbs se- seb see seh sek seo ser ses sh- shb she shh shk sho shr shs sk- skb ske skh skk sko skr sks sob soe soh sok soo sor sos sr- srb sre srh srk sro srr srs ss- ssb sse ssh ssk sso ssr sss