-er -ic b-u bbb bbc bbd bbe bbi bbr bbt bbu bcb bcc bcd bce bci bcr bct bcu bdb bdc bdd bde bdi bdr bdt bdu be- beb bec bed bee bei ber bet beu bi- bib bic bid bie bii bir bit biu brb brd bre bri brr brt bru btb btc btd bte bti btr btt btu bub buc bud bue bui bur but buu c-- cbb cbc cbd cbe cbi cbr cbt cbu ccb ccc ccd cce cci ccr cct ccu cdb cdc cdd cde cdi cdr cdt cdu ce- ceb cec ced cee cei cer cet ceu ci- cib cic cid cie cii cir cit ciu crb crc crd cre cri crr crt cru ctb ctc ctd cte cti ctr ctt ctu cub cuc cud cue cui cur cut cuu dbb dbc dbd dbe dbi dbr dbt dbu dcb dcc dcd dce dci dcr dct dcu ddb ddc ddd dde ddi ddr ddt ddu de- deb dec ded dee dei der det deu di- dib dic did die dii dir dit diu drb drc drd dre dri drr drt dru dtb dtc dtd dte dti dtr dtt dtu dub duc dud due dui dur dut ebb ebc ebd ebe ebi ebr ebt ebu ec- ecb ecc ecd ece eci ecr ect ecu ed- edb edc edd ede edi edr edt edu eeb eec eed eee eer eet eib eic eid eie eii eir eit eiu erb erc erd ere eri err ert eru etb etc etd ete eti etr ett etu eu- eub euc eud eue eui eur eut i-d ibb ibc ibd ibe ibi ibr ibt ibu icb icc icd ice ici icr ict icu idb idc idd ide idi idr idt idu ie- iec ied iee iei ier iet iib iic iid iie iii iir iit iiu ir- irb irc ird ire iri irr irt iru itb itc itd ite iti itt itu iu- iub iuc iud iue iui iur iut rbb rbc rbd rbe rbi rbr rbt rbu rcb rcc rcd rce rci rcr rct rcu rdb rdc rdd rde rdi rdr rdt rdu re- reb rec red ree rei rer ret reu rib ric rid rie rii rir rit rrb rrc rrd rri rrr rrt rru rtb rtc rtd rte rti rtr rtt rtu rub ruc rud rue rui rur rut ruu tbb tbc tbd tbe tbi tbr tbt tbu tcb tcc tcd tce tci tcr tct tcu tdb tdc tdd tde tdi tdr tdt tdu te- teb tec ted tee tei ter tet teu tib tic tid tie tii tir tit tiu trb trc trd tre tri trr trt tru ttb ttc ttd tte tti ttr ttt ttu tub tuc tud tue tui tur tut tuu ubb ubc ube ubi ubr ubt ubu ucb ucc ucd uce uci ucr uct ucu udb udc udd ude udi udr udt udu ueb uec ued uee uei uer uet uib uic uid uie uii uir uit uiu ur- urb urc urd ure uri urr urt uru utb utc utd ute uti utr utt utu uuc uue uur uut uuu