bbb bbc bbe bbh bbk bbo bbs bbx bcb bcc bce bch bck bco bcs bcx be- beb bec bee beh bek beo bes bex bhb bhc bhe bhh bhk bho bhs bhx bkb bkc bke bkk bko bks bkx bob boc boe boh bok boo bos box bsb bsc bse bsh bsk bso bss bsx bxb bxo bxx c-- cbb cbc cbe cbh cbk cbo cbs cbx ccb ccc cce cch cck cco ccs ccx ce- ceb cec cee ceh cek ceo ces cex ch- chb chc che chh chk cho chs chx ckb ckc ckh cko cks ckx co- cob coc coe coh cok coo cos cox csb csc cse csh csk cso css csx cxc cxh cxk cxo cxs cxx ebb ebc ebe ebh ebk ebo ebs ebx ec- ecb ecc ece ech eck eco ecs ecx eeb eec eee eek eeo ees eex 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 esx ex- exc exe exh exo exs exx hbb hbc hbe hbh hbk hbo hbs hbx hcb hcc hce hch hck hco hcs he- heb hec hee heh hek heo hes hex hhb hhc hhe hhh hhk hho hhs hkb hkh hkk hko hks hob hoc hoe hoh hok hoo hos hox hsb hsc hse hsh hsk hss hsx hxc kbb kbc kbe kbh kbk kbo kbs kbx kcb kcc kce kch kck kcs kcx ke- keb kec kee keh kek keo kes kex 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 kxo ob- obb obc obe obh obk obo obs obx oc- ocb occ och ock oco ocs ocx oeb oec oee oeh oeo oes oex ohc ohe ohh oho ohs okb okc oke okk oko oks oo- oob ooc ooh ook ooo oos oox os- osb osc ose osh osk oso oss osx ox- oxb oxc oxo oxx sbb sbc sbe sbh sbk sbo sbs sbx scb scc sce sch sck sco scs scx se- seb sec see seh sek seo ses sex sh- shb shc she shh shk sho shs sk- skb skc ske skh skk sko sks skx sob soc soe soh sok soo sos sox ss- ssb ssc sse ssh ssk sso sss ssx sxc sxs xbc xbe xbx xcb xch xcx xee xes xex xkb xke xks xoc xok xoo xos xox xsb xsc xss xxo xxx