-er b-u bbb bbc bbd bbe bbn bbo bbr bbs bbu bcb bcc bcd bce bcn bco bcr bcs bcu bdb bdc bdd bde bdo bdr bds bdu be- beb bec bed bee ben beo ber bes beu bnb bnc bnd bne bnn bno bnr bns bnu bob boc bod boe bon boo bor bos bou brb brd bre brn bro brr brs bru bsb bsc bsd bse bsn bso bsr bss bsu bub buc bud bue bun buo bur bus buu c-- cbb cbc cbd cbe cbn cbo cbr cbs cbu ccb ccc ccd cce ccn cco ccr ccs ccu cdb cdc cdd cde cdn cdo cdr cds cdu ce- ceb cec ced cee cen ceo cer ces ceu cn- cnb cnc cnd cne cnn cno cnr cns cnu co- cob coc cod coe con coo cor cos cou crb crc crd cre crn cro crr crs cru csb csc csd cse csn cso csr css csu cub cuc cud cue cun cuo cur cus cuu dbb dbc dbd dbe dbn dbo dbr dbs dbu dcb dcc dcd dce dcn dco dcr dcs dcu ddb ddc ddd dde ddn ddo ddr dds ddu de- deb dec ded dee den deo der des deu dnb dnc dnd dne dnn dno dnr dns dob doc dod doe don doo dor dos dou drb drc drd dre drn dro drr drs dru dsb dsc dsd dse dsn dso dsr dss dsu dub duc dud due dun duo dur dus ebb ebc ebd ebe ebn ebo ebr ebs ebu ec- ecb ecc ecd ece ecn eco ecr ecs ecu ed- edb edc edd ede edn edo edr eds edu eeb eec eed eee een eeo eer ees en- enb enc end ene enn eno enr ens enu eo- eob eoc eod eoe eon eoo eor eos eou erb erc erd ere ern ero err ers eru es- esb esc esd ese esn eso esr ess esu eu- eub euc eud eue eun eur eus nbb nbc nbd nbe nbn nbo nbr nbs nbu ncb ncc ncd nce ncn nco ncr ncs ncu ndb ndc ndd nde ndn ndo ndr nds ndu ne- neb nec ned nee nen neo ner nes neu nnb nnc nne nnn nno nns nnu no- nob noc nod noe non noo nor nos nou nrb nrc nrd nre nrn nro nrr nrs nru nsb nsc nsd nse nsn nso nsr nss nsu nub nuc nud nue nun nuo nur nus nuu ob- obb obc obd obe obn obo obr obs obu oc- ocb occ ocd ocn oco ocr ocs ocu odb odc odd ode odn odo odr ods odu oeb oec oed oee oen oeo oer oes on- onb onc ond one onn ono onr ons onu oo- oob ooc ood oon ooo oor oos or- orb orc ord ore orn oro orr ors oru os- osb osc osd ose osn oso osr oss osu ou- ouc oud oue oun ouo our ous rbb rbc rbd rbe rbn rbo rbr rbs rbu rcb rcc rcd rce rcn rco rcr rcs rcu rdb rdc rdd rde rdn rdo rdr rds rdu re- reb rec red ree ren reo rer res reu rnb rnc rnd rnn rno rnr rns rnu rob roc rod roe ron roo ror ros rou rrb rrc rrd rrn rrr rrs rru rsb rsc rsd rse rsn rso rsr rss rsu rub ruc rud rue run ruo rur rus ruu sbb sbc sbd sbe sbn sbo sbr sbs sbu scb scc scd sce scn sco scr scs scu sdb sdc sdd sde sdn sdo sdr sds sdu se- seb sec sed see sen seo ser ses seu snb snc snd sne snn sno snr sns snu sob soc sod soe son soo sor sos sou sr- srb src srd sre srn sro srr srs ss- ssb ssc ssd sse ssn sso ssr sss ssu sub suc sud sue sun suo sur sus suu ubb ubc ube ubn ubo ubr ubs ubu ucb ucc ucd uce ucn uco ucr ucs ucu udb udc udd ude udn udo udr uds udu ueb uec ued uee uen uer ues un- unb unc und une unn uno unr uns unu uob uoc uod uoe uon uoo uor uos ur- urb urc urd ure urn uro urr urs uru usb usc usd use usn uso usr uss usu uuc uue uun uur uus uuu