bbb bbc bbe bbh bbk bbo bbx bcb bcc bce bch bck bco bcx be- beb bec bee beh bek beo bex bhb bhc bhe bhh bhk bho bhx bkb bkc bke bkk bko bkx bob boc boe boh bok boo box bxb bxo bxx c-- cbb cbc cbe cbh cbk cbo cbx ccb ccc cce cch cck cco ccx ce- ceb cec cee ceh cek ceo cex ch- chb chc che chh chk cho chx ckb ckc ckh cko ckx co- cob coc coe coh cok coo cox cxc cxh cxk cxo cxx ebb ebc ebe ebh ebk ebo ebx ec- ecb ecc ece ech eck eco ecx eeb eec eee eek eeo eex ehb ehc ehe ehh eho ekb ekc eke ekh eko eo- eob eoc eoe eoh eok eoo ex- exc exe exh exo exx hbb hbc hbe hbh hbk hbo hbx hcb hcc hce hch hck hco he- heb hec hee heh hek heo hex hhb hhc hhe hhh hhk hho hkb hkh hkk hko hob hoc hoe hoh hok hoo hox hxc kbb kbc kbe kbh kbk kbo kbx kcb kcc kce kch kck kcx ke- keb kec kee keh kek keo kex khe khh khk kho kkb kkc kke kkh kkk kob koc koe koh kok koo kxo ob- obb obc obe obh obk obo obx oc- ocb occ och ock oco ocx oeb oec oee oeh oeo oex ohc ohe ohh oho okb okc oke okk oko oo- oob ooc ooh ook ooo oox ox- oxb oxc oxo oxx xbc xbe xbx xcb xch xcx xee xex xkb xke xoc xok xoo xox xxo xxx