-er b-u bbb bbc bbd bbe bbn bbo bbr bbu bcb bcc bcd bce bcn bco bcr bcu bdb bdc bdd bde bdo bdr bdu be- beb bec bed bee ben beo ber beu bnb bnc bnd bne bnn bno bnr bnu bob boc bod boe bon boo bor bou brb brd bre brn bro brr bru bub buc bud bue bun buo bur buu c-- cbb cbc cbd cbe cbn cbo cbr cbu ccb ccc ccd cce ccn cco ccr ccu cdb cdc cdd cde cdn cdo cdr cdu ce- ceb cec ced cee cen ceo cer ceu cn- cnb cnc cnd cne cnn cno cnr cnu co- cob coc cod coe con coo cor cou crb crc crd cre crn cro crr cru cub cuc cud cue cun cuo cur cuu dbb dbc dbd dbe dbn dbo dbr dbu dcb dcc dcd dce dcn dco dcr dcu ddb ddc ddd dde ddn ddo ddr ddu de- deb dec ded dee den deo der deu dnb dnc dnd dne dnn dno dnr dob doc dod doe don doo dor dou drb drc drd dre drn dro drr dru dub duc dud due dun duo dur ebb ebc ebd ebe ebn ebo ebr ebu ec- ecb ecc ecd ece ecn eco ecr ecu ed- edb edc edd ede edn edo edr edu eeb eec eed eee een eeo eer en- enb enc end ene enn eno enr enu eo- eob eoc eod eoe eon eoo eor eou erb erc erd ere ern ero err eru eu- eub euc eud eue eun eur nbb nbc nbd nbe nbn nbo nbr nbu ncb ncc ncd nce ncn nco ncr ncu ndb ndc ndd nde ndn ndo ndr ndu ne- neb nec ned nee nen neo ner neu nnb nnc nne nnn nno nnu no- nob noc nod noe non noo nor nou nrb nrc nrd nre nrn nro nrr nru nub nuc nud nue nun nuo nur nuu ob- obb obc obd obe obn obo obr obu oc- ocb occ ocd ocn oco ocr ocu odb odc odd ode odn odo odr odu oeb oec oed oee oen oeo oer on- onb onc ond one onn ono onr onu oo- oob ooc ood oon ooo oor or- orb orc ord ore orn oro orr oru ou- ouc oud oue oun ouo our rbb rbc rbd rbe rbn rbo rbr rbu rcb rcc rcd rce rcn rco rcr rcu rdb rdc rdd rde rdn rdo rdr rdu re- reb rec red ree ren reo rer reu rnb rnc rnd rnn rno rnr rnu rob roc rod roe ron roo ror rou rrb rrc rrd rrn rrr rru rub ruc rud rue run ruo rur ruu ubb ubc ube ubn ubo ubr ubu ucb ucc ucd uce ucn uco ucr ucu udb udc udd ude udn udo udr udu ueb uec ued uee uen uer un- unb unc und une unn uno unr unu uob uoc uod uoe uon uoo uor ur- urb urc urd ure urn uro urr uru uuc uue uun uur uuu