bbb bbc bbe bbh bbk bbo bbs bcb bcc bce bch bck bco bcs be- beb bec bee beh bek beo bes bhb bhc bhe bhh bhk bho bhs bkb bkc bke bkk bko bks bob boc boe boh bok boo bos bsb bsc bse bsh bsk bso bss c-- cbb cbc cbe cbh cbk cbo cbs ccb ccc cce cch cck cco ccs ce- ceb cec cee ceh cek ceo ces ch- chb chc che chh chk cho chs ckb ckc ckh cko cks co- cob coc coe coh cok coo cos csb csc cse csh csk cso css ebb ebc ebe ebh ebk ebo ebs ec- ecb ecc ece ech eck eco ecs eeb eec eee eek eeo ees ehb ehc ehe ehh eho ehs ekb ekc eke ekh eko eks eo- eob eoc eoe eoh eok eoo eos es- esb esc ese esh esk eso ess hbb hbc hbe hbh hbk hbo hbs hcb hcc hce hch hck hco hcs he- heb hec hee heh hek heo hes hhb hhc hhe hhh hhk hho hhs hkb hkh hkk hko hks hob hoc hoe hoh hok hoo hos hsb hsc hse hsh hsk hss kbb kbc kbe kbh kbk kbo kbs kcb kcc kce kch kck kcs ke- keb kec kee keh kek keo kes khe khh khk kho khs kkb kkc kke kkh kkk kks kob koc koe koh kok koo kos ksb ksc kse ksh ksk kso kss ob- obb obc obe obh obk obo obs oc- ocb occ och ock oco ocs oeb oec oee oeh oeo oes ohc ohe ohh oho ohs okb okc oke okk oko oks oo- oob ooc ooh ook ooo oos os- osb osc ose osh osk oso oss sbb sbc sbe sbh sbk sbo sbs scb scc sce sch sck sco scs se- seb sec see seh sek seo ses sh- shb shc she shh shk sho shs sk- skb skc ske skh skk sko sks sob soc soe soh sok soo sos ss- ssb ssc sse ssh ssk sso sss