-ol bbb bbc bbe bbh bbk bbl bbo bbs bcb bcc bce bch bck bcl bco bcs be- beb bec bee beh bek bel beo bes bhb bhc bhe bhh bhk bhl bho bhs bkb bkc bke bkk bkl bko bks blb blc ble blh blk bll blo bls bob boc boe boh bok bol boo bos bsb bsc bse bsh bsk bsl bso bss c-- cbb cbc cbe cbh cbk cbl cbo cbs ccb ccc cce cch cck ccl cco ccs ce- ceb cec cee ceh cek cel ceo ces ch- chb chc che chh chk chl cho chs ckb ckc ckh cko cks cl- clb clc cle clh clk cll clo cls co- cob coc coe coh cok col coo cos csb csc cse csh csk csl cso css ebb ebc ebe ebh ebk ebl ebo ebs ec- ecb ecc ece ech eck ecl eco ecs eeb eec eee eek eel eeo ees ehb ehc ehe ehh ehl eho ehs ekb ekc eke ekh ekl eko eks elb elc ele elh elk ell elo els eo- eob eoc eoe eoh eok eol eoo eos es- esb esc ese esh esk esl eso ess hbb hbc hbe hbh hbk hbl hbo hbs hcb hcc hce hch hck hcl hco hcs he- heb hec hee heh hek hel heo hes hhb hhc hhe hhh hhk hhl hho hhs hkb hkh hkk hkl hko hks hlb hlc hle hlh hll hlo hls hob hoc hoe hoh hok hol hoo hos hsb hsc hse hsh hsk hsl hss kbb kbc kbe kbh kbk kbl kbo kbs kcb kcc kce kch kck kcl kcs ke- keb kec kee keh kek kel keo kes khe khh khk kho khs kkb kkc kke kkh kkk kkl kks kl- klb klc klh klo kls kob koc koe koh kok kol koo kos ksb ksc kse ksh ksk ksl kso kss lbb lbc lbe lbh lbk lbl lbo lbs lcb lcc lce lch lck lcl lco lcs leb lec lee leh lek lel leo les lhb lhc lhh lhk lho lhs lkb lkh lkl lks llb llc lle llk lll llo lls lob loc loe loh lok lol loo los lsb lsc lse lsh lsk lsl lso lss ob- obb obc obe obh obk obl obo obs oc- ocb occ och ock ocl oco ocs oeb oec oee oeh oel oeo oes ohc ohe ohh ohl oho ohs okb okc oke okk okl oko oks olb olc ole olk oll olo ols oo- oob ooc ooh ook ool ooo oos os- osb osc ose osh osk osl oso oss sbb sbc sbe sbh sbk sbl sbo sbs scb scc sce sch sck scl sco scs se- seb sec see seh sek sel seo ses sh- shb shc she shh shk shl sho shs sk- skb skc ske skh skk skl sko sks slb slc sle slh slk sll slo sls sob soc soe soh sok sol soo sos ss- ssb ssc sse ssh ssk ssl sso sss