bbb bbc bbe bbh bbk bbn bbo bcb bcc bce bch bck bcn bco be- beb bec bee beh bek ben beo bhb bhc bhe bhh bhk bho bkb bkc bke bkk bkn bko bnb bnc bne bnk bnn bno bob boc boe boh bok bon boo c-- cbb cbc cbe cbh cbk cbn cbo ccb ccc cce cch cck ccn cco ce- ceb cec cee ceh cek cen ceo ch- chb chc che chh chk chn cho ckb ckc ckh cko cn- cnb cnc cne cnh cnn cno co- cob coc coe coh cok con coo ebb ebc ebe ebh ebk ebn ebo ec- ecb ecc ece ech eck ecn eco eeb eec eee eek een eeo ehb ehc ehe ehh ehn eho ekb ekc eke ekh eko en- enb enc ene enh enk enn eno eo- eob eoc eoe eoh eok eon eoo hbb hbc hbe hbh hbk hbn hbo hcb hcc hce hch hck hcn hco he- heb hec hee heh hek hen heo hhb hhc hhe hhh hhk hhn hho hkb hkh hkk hkn hko hnb hnc hne hnh hnk hnn hno hob hoc hoe hoh hok hon hoo kbb kbc kbe kbh kbk kbn kbo kcb kcc kce kch kck kcn ke- keb kec kee keh kek ken keo khe khh khk khn kho kkb kkc kke kkh kkk kkn kn- knc kne knk knn kno kob koc koe koh kok kon koo nbb nbc nbe nbk nbn nbo ncb ncc nce nch nck ncn nco ne- neb nec nee neh nek nen neo nhb nhc nhe nhh nhk nhn nkc nke nkk nkn nko nnb nnc nne nnh nnk nnn nno no- nob noc noe noh nok non noo ob- obb obc obe obh obk obn obo oc- ocb occ och ock ocn oco oeb oec oee oeh oen oeo ohc ohe ohh ohn oho okb okc oke okk oko on- onb onc one onh onk onn ono oo- oob ooc ooh ook oon ooo