-er b-u bbb bbc bbd bbe bbn bbo bbr bbt bbu bcb bcc bcd bce bcn bco bcr bct bcu bdb bdc bdd bde bdo bdr bdt bdu be- beb bec bed bee ben beo ber bet beu bnb bnc bnd bne bnn bno bnr bnt bnu bob boc bod boe bon boo bor bot bou brb brd bre brn bro brr brt bru btb btc btd bte btn bto btr btt btu bub buc bud bue bun buo bur but buu c-- cbb cbc cbd cbe cbn cbo cbr cbt cbu ccb ccc ccd cce ccn cco ccr cct ccu cdb cdc cdd cde cdn cdo cdr cdt cdu ce- ceb cec ced cee cen ceo cer cet ceu cn- cnb cnc cnd cne cnn cno cnr cnt cnu co- cob coc cod coe con coo cor cot cou crb crc crd cre crn cro crr crt cru ctb ctc ctd cte ctn cto ctr ctt ctu cub cuc cud cue cun cuo cur cut cuu dbb dbc dbd dbe dbn dbo dbr dbt dbu dcb dcc dcd dce dcn dco dcr dct dcu ddb ddc ddd dde ddn ddo ddr ddt ddu de- deb dec ded dee den deo der det deu dnb dnc dnd dne dnn dno dnr dnt dob doc dod doe don doo dor dot dou drb drc drd dre drn dro drr drt dru dtb dtc dtd dte dtn dto dtr dtt dtu dub duc dud due dun duo dur dut ebb ebc ebd ebe ebn ebo ebr ebt ebu ec- ecb ecc ecd ece ecn eco ecr ect ecu ed- edb edc edd ede edn edo edr edt edu eeb eec eed eee een eeo eer eet en- enb enc end ene enn eno enr ent enu eo- eob eoc eod eoe eon eoo eor eot eou erb erc erd ere ern ero err ert eru etb etc etd ete etn eto etr ett etu eu- eub euc eud eue eun eur eut nbb nbc nbd nbe nbn nbo nbr nbt nbu ncb ncc ncd nce ncn nco ncr nct ncu ndb ndc ndd nde ndn ndo ndr ndt ndu ne- neb nec ned nee nen neo ner net neu nnb nnc nne nnn nno nnt nnu no- nob noc nod noe non noo nor not nou nrb nrc nrd nre nrn nro nrr nrt nru ntb ntc ntd nte ntn nto ntr ntt ntu nub nuc nud nue nun nuo nur nut nuu ob- obb obc obd obe obn obo obr obt obu oc- ocb occ ocd ocn oco ocr oct ocu odb odc odd ode odn odo odr odt odu oeb oec oed oee oen oeo oer oet on- onb onc ond one onn ono onr ont onu oo- oob ooc ood oon ooo oor oot or- orb orc ord ore orn oro orr ort oru ot- otb otc otd ote otn oto otr ott otu ou- ouc oud oue oun ouo our out rbb rbc rbd rbe rbn rbo rbr rbt rbu rcb rcc rcd rce rcn rco rcr rct rcu rdb rdc rdd rde rdn rdo rdr rdt rdu re- reb rec red ree ren reo rer ret reu rnb rnc rnd rnn rno rnr rnt rnu rob roc rod roe ron roo ror rot rou rrb rrc rrd rrn rrr rrt rru rtb rtc rtd rte rtn rto rtr rtt rtu rub ruc rud rue run ruo rur rut ruu tbb tbc tbd tbe tbn tbo tbr tbt tbu tcb tcc tcd tce tcn tco tcr tct tcu tdb tdc tdd tde tdn tdo tdr tdt tdu te- teb tec ted tee ten teo ter tet teu tnb tnc tnd tne tnn tno tnr tnt to- tob toc tod toe ton too tor tot tou trb trc trd tre trn tro trr trt tru ttb ttc ttd tte ttn tto ttr ttt ttu tub tuc tud tue tun tuo tur tut tuu ubb ubc ube ubn ubo ubr ubt ubu ucb ucc ucd uce ucn uco ucr uct ucu udb udc udd ude udn udo udr udt udu ueb uec ued uee uen uer uet un- unb unc und une unn uno unr unt unu uob uoc uod uoe uon uoo uor uot ur- urb urc urd ure urn uro urr urt uru utb utc utd ute utn uto utr utt utu uuc uue uun uur uut uuu