-ol bbb bbc bbe bbh bbk bbl bbo bcb bcc bce bch bck bcl bco be- beb bec bee beh bek bel beo bhb bhc bhe bhh bhk bhl bho bkb bkc bke bkk bkl bko blb blc ble blh blk bll blo bob boc boe boh bok bol boo c-- cbb cbc cbe cbh cbk cbl cbo ccb ccc cce cch cck ccl cco ce- ceb cec cee ceh cek cel ceo ch- chb chc che chh chk chl cho ckb ckc ckh cko cl- clb clc cle clh clk cll clo co- cob coc coe coh cok col coo ebb ebc ebe ebh ebk ebl ebo ec- ecb ecc ece ech eck ecl eco eeb eec eee eek eel eeo ehb ehc ehe ehh ehl eho ekb ekc eke ekh ekl eko elb elc ele elh elk ell elo eo- eob eoc eoe eoh eok eol eoo hbb hbc hbe hbh hbk hbl hbo hcb hcc hce hch hck hcl hco he- heb hec hee heh hek hel heo hhb hhc hhe hhh hhk hhl hho hkb hkh hkk hkl hko hlb hlc hle hlh hll hlo hob hoc hoe hoh hok hol hoo kbb kbc kbe kbh kbk kbl kbo kcb kcc kce kch kck kcl ke- keb kec kee keh kek kel keo khe khh khk kho kkb kkc kke kkh kkk kkl kl- klb klc klh klo kob koc koe koh kok kol koo lbb lbc lbe lbh lbk lbl lbo lcb lcc lce lch lck lcl lco leb lec lee leh lek lel leo lhb lhc lhh lhk lho lkb lkh lkl llb llc lle llk lll llo lob loc loe loh lok lol loo ob- obb obc obe obh obk obl obo oc- ocb occ och ock ocl oco oeb oec oee oeh oel oeo ohc ohe ohh ohl oho okb okc oke okk okl oko olb olc ole olk oll olo oo- oob ooc ooh ook ool ooo