bbb bbc bbe bbh bbk bbo bcb bcc bce bch bck bco be- beb bec bee beh bek beo bhb bhc bhe bhh bhk bho bkb bkc bke bkk bko bob boc boe boh bok boo c-- cbb cbc cbe cbh cbk cbo ccb ccc cce cch cck cco ce- ceb cec cee ceh cek ceo ch- chb chc che chh chk cho ckb ckc ckh cko co- cob coc coe coh cok coo ebb ebc ebe ebh ebk ebo ec- ecb ecc ece ech eck eco eeb eec eee eek eeo ehb ehc ehe ehh eho ekb ekc eke ekh eko eo- eob eoc eoe eoh eok eoo hbb hbc hbe hbh hbk hbo hcb hcc hce hch hck hco he- heb hec hee heh hek heo hhb hhc hhe hhh hhk hho hkb hkh hkk hko hob hoc hoe hoh hok hoo kbb kbc kbe kbh kbk kbo kcb kcc kce kch kck ke- keb kec kee keh kek keo khe khh khk kho kkb kkc kke kkh kkk kob koc koe koh kok koo ob- obb obc obe obh obk obo oc- ocb occ och ock oco oeb oec oee oeh oeo ohc ohe ohh oho okb okc oke okk oko oo- oob ooc ooh ook ooo