-er b-u bbb bbc bbd bbe bbo bbr bbt bbu bcb bcc bcd bce bco bcr bct bcu bdb bdc bdd bde bdo bdr bdt bdu be- beb bec bed bee beo ber bet beu bob boc bod boe boo bor bot bou brb brd bre bro brr brt bru btb btc btd bte bto btr btt btu bub buc bud bue buo bur but buu c-- cbb cbc cbd cbe cbo cbr cbt cbu ccb ccc ccd cce cco ccr cct ccu cdb cdc cdd cde cdo cdr cdt cdu ce- ceb cec ced cee ceo cer cet ceu co- cob coc cod coe coo cor cot cou crb crc crd cre cro crr crt cru ctb ctc ctd cte cto ctr ctt ctu cub cuc cud cue cuo cur cut cuu dbb dbc dbd dbe dbo dbr dbt dbu dcb dcc dcd dce dco dcr dct dcu ddb ddc ddd dde ddo ddr ddt ddu de- deb dec ded dee deo der det deu dob doc dod doe doo dor dot dou drb drc drd dre dro drr drt dru dtb dtc dtd dte dto dtr dtt dtu dub duc dud due duo dur dut ebb ebc ebd ebe ebo ebr ebt ebu ec- ecb ecc ecd ece eco ecr ect ecu ed- edb edc edd ede edo edr edt edu eeb eec eed eee eeo eer eet eo- eob eoc eod eoe eoo eor eot eou erb erc erd ere ero err ert eru etb etc etd ete eto etr ett etu eu- eub euc eud eue eur eut ob- obb obc obd obe obo obr obt obu oc- ocb occ ocd oco ocr oct ocu odb odc odd ode odo odr odt odu oeb oec oed oee oeo oer oet oo- oob ooc ood ooo oor oot or- orb orc ord ore oro orr ort oru ot- otb otc otd ote oto otr ott otu ou- ouc oud oue ouo our out rbb rbc rbd rbe rbo rbr rbt rbu rcb rcc rcd rce rco rcr rct rcu rdb rdc rdd rde rdo rdr rdt rdu re- reb rec red ree reo rer ret reu rob roc rod roe roo ror rot rou rrb rrc rrd rrr rrt rru rtb rtc rtd rte rto rtr rtt rtu rub ruc rud rue ruo rur rut ruu tbb tbc tbd tbe tbo tbr tbt tbu tcb tcc tcd tce tco tcr tct tcu tdb tdc tdd tde tdo tdr tdt tdu te- teb tec ted tee teo ter tet teu to- tob toc tod toe too tor tot tou trb trc trd tre tro trr trt tru ttb ttc ttd tte tto ttr ttt ttu tub tuc tud tue tuo tur tut tuu ubb ubc ube ubo ubr ubt ubu ucb ucc ucd uce uco ucr uct ucu udb udc udd ude udo udr udt udu ueb uec ued uee uer uet uob uoc uod uoe uoo uor uot ur- urb urc urd ure uro urr urt uru utb utc utd ute uto utr utt utu uuc uue uur uut uuu