bbb bbc bbd bbe bbk bbn bbo bcb bcc bcd bce bck bcn bco bdb bdc bdd bde bdk bdo be- beb bec bed bee bek ben beo bkb bkc bke bkk bkn bko bnb bnc bnd bne bnk bnn bno bob boc bod boe bok bon boo c-- cbb cbc cbd cbe cbk cbn cbo ccb ccc ccd cce cck ccn cco cdb cdc cdd cde cdk cdn cdo ce- ceb cec ced cee cek cen ceo ckb ckc ckd cko cn- cnb cnc cnd cne cnn cno co- cob coc cod coe cok con coo dbb dbc dbd dbe dbk dbn dbo dcb dcc dcd dce dck dcn dco ddb ddc ddd dde ddk ddn ddo de- deb dec ded dee dek den deo dkb dkc dke dkk dko dnb dnc dnd dne dnk dnn dno dob doc dod doe dok don doo ebb ebc ebd ebe ebk ebn ebo ec- ecb ecc ecd ece eck ecn eco ed- edb edc edd ede edk edn edo eeb eec eed eee eek een eeo ekb ekc ekd eke eko en- enb enc end ene enk enn eno eo- eob eoc eod eoe eok eon eoo kbb kbc kbd kbe kbk kbn kbo kcb kcc kcd kce kck kcn kdb kdc kde kdk kdo ke- keb kec ked kee kek ken keo kkb kkc kke kkk kkn kn- knc knd kne knk knn kno kob koc kod koe kok kon koo nbb nbc nbd nbe nbk nbn nbo ncb ncc ncd nce nck ncn nco ndb ndc ndd nde ndk ndn ndo ne- neb nec ned nee nek nen neo nkc nke nkk nkn nko nnb nnc nne nnk nnn nno no- nob noc nod noe nok non noo ob- obb obc obd obe obk obn obo oc- ocb occ ocd ock ocn oco odb odc odd ode odn odo oeb oec oed oee oen oeo okb okc okd oke okk oko on- onb onc ond one onk onn ono oo- oob ooc ood ook oon ooo