-er b-u bbb bbc bbd bbe bbl bbr bbt bbu bcb bcc bcd bce bcl bcr bct bcu bdb bdc bdd bde bdl bdr bdt bdu be- beb bec bed bee bel ber bet beu blb blc bld ble bll blr blt blu brb brd bre brl brr brt bru btb btc btd bte btl btr btt btu bub buc bud bue bul bur but buu c-- cbb cbc cbd cbe cbl cbr cbt cbu ccb ccc ccd cce ccl ccr cct ccu cdb cdc cdd cde cdl cdr cdt cdu ce- ceb cec ced cee cel cer cet ceu cl- clb clc cld cle cll clr clt clu crb crc crd cre crl crr crt cru ctb ctc ctd cte ctl ctr ctt ctu cub cuc cud cue cul cur cut cuu dbb dbc dbd dbe dbl dbr dbt dbu dcb dcc dcd dce dcl dcr dct dcu ddb ddc ddd dde ddl ddr ddt ddu de- deb dec ded dee del der det deu dl- dlb dlc dld dle dll dlr dlt dlu drb drc drd dre drl drr drt dru dtb dtc dtd dte dtl dtr dtt dtu dub duc dud due dul dur dut ebb ebc ebd ebe ebl ebr ebt ebu ec- ecb ecc ecd ece ecl ecr ect ecu ed- edb edc edd ede edl edr edt edu eeb eec eed eee eel eer eet elb elc eld ele ell elr elt elu erb erc erd ere erl err ert eru etb etc etd ete etl etr ett etu eu- eub euc eud eue eul eur eut lbb lbc lbd lbe lbl lbr lbt lbu lcb lcc lcd lce lcl lcr lct lcu ldb ldc ldd lde ldl ldr ldt ldu leb lec led lee lel ler let leu llb llc lld lle lll llr llt llu lrb lrc lrd lrr lrt lru ltb ltc ltd lte ltl ltr ltt ltu lub luc lud lue lul lur lut luu rbb rbc rbd rbe rbl rbr rbt rbu rcb rcc rcd rce rcl rcr rct rcu rdb rdc rdd rde rdl rdr rdt rdu re- reb rec red ree rel rer ret reu rlc rld rle rll rlr rlt rlu rrb rrc rrd rrl rrr rrt rru rtb rtc rtd rte rtl rtr rtt rtu rub ruc rud rue rur rut ruu tbb tbc tbd tbe tbl tbr tbt tbu tcb tcc tcd tce tcl tcr tct tcu tdb tdc tdd tde tdl tdr tdt tdu te- teb tec ted tee tel ter tet teu tlc tld tle tll tlr tlt tlu trb trc trd tre trl trr trt tru ttb ttc ttd tte ttl ttr ttt ttu tub tuc tud tue tul tur tut tuu ubb ubc ube ubl ubr ubt ubu ucb ucc ucd uce ucl ucr uct ucu udb udc udd ude udl udr udt udu ueb uec ued uee uel uer uet ulb ulc uld ule ull ulr ult ulu ur- urb urc urd ure url urr urt uru utb utc utd ute utl utr utt utu uuc uue uur uut uuu