b-u bbb bbc bbd bbe bbk bbn bbo bbu bcb bcc bcd bce bck bcn bco bcu bdb bdc bdd bde bdk bdo bdu be- beb bec bed bee bek ben beo beu bkb bkc bke bkk bkn bko bnb bnc bnd bne bnk bnn bno bnu bob boc bod boe bok bon boo bou bub buc bud bue buk bun buo buu c-- cbb cbc cbd cbe cbk cbn cbo cbu ccb ccc ccd cce cck ccn cco ccu cdb cdc cdd cde cdk cdn cdo cdu ce- ceb cec ced cee cek cen ceo ceu ckb ckc ckd cko cn- cnb cnc cnd cne cnn cno cnu co- cob coc cod coe cok con coo cou cub cuc cud cue cuk cun cuo cuu dbb dbc dbd dbe dbk dbn dbo dbu dcb dcc dcd dce dck dcn dco dcu ddb ddc ddd dde ddk ddn ddo ddu de- deb dec ded dee dek den deo deu dkb dkc dke dkk dko dku dnb dnc dnd dne dnk dnn dno dob doc dod doe dok don doo dou dub duc dud due duk dun duo ebb ebc ebd ebe ebk ebn ebo ebu ec- ecb ecc ecd ece eck ecn eco ecu ed- edb edc edd ede edk edn edo edu eeb eec eed eee eek een eeo ekb ekc ekd eke eko eku en- enb enc end ene enk enn eno enu eo- eob eoc eod eoe eok eon eoo eou eu- eub euc eud eue eun kbb kbc kbd kbe kbk kbn kbo kbu kcb kcc kcd kce kck kcn kcu kdb kdc kde kdk kdo kdu ke- keb kec ked kee kek ken keo kkb kkc kke kkk kkn kku kn- knc knd kne knk knn kno knu kob koc kod koe kok kon koo kou kub kuc kud kue kuk kun kuu nbb nbc nbd nbe nbk nbn nbo nbu ncb ncc ncd nce nck ncn nco ncu ndb ndc ndd nde ndk ndn ndo ndu ne- neb nec ned nee nek nen neo neu nkc nke nkk nkn nko nku nnb nnc nne nnk nnn nno nnu no- nob noc nod noe nok non noo nou nub nuc nud nue nuk nun nuo nuu ob- obb obc obd obe obk obn obo obu oc- ocb occ ocd ock ocn oco ocu odb odc odd ode odn odo odu oeb oec oed oee oen oeo okb okc okd oke okk oko oku on- onb onc ond one onk onn ono onu oo- oob ooc ood ook oon ooo ou- ouc oud oue ouk oun ouo ubb ubc ube ubk ubn ubo ubu ucb ucc ucd uce uck ucn uco ucu udb udc udd ude udk udn udo udu ueb uec ued uee uen ukb ukc uke ukk ukn uku un- unb unc und une unk unn uno unu uob uoc uod uoe uok uon uoo uuc uue uun uuu