-er -ic b-u bbb bbc bbd bbe bbi bbr bbs bbt bbu bcb bcc bcd bce bci bcr bcs bct bcu bdb bdc bdd bde bdi bdr bds bdt bdu be- beb bec bed bee bei ber bes bet beu bi- bib bic bid bie bii bir bis bit biu brb brd bre bri brr brs brt bru bsb bsc bsd bse bsi bsr bss bst bsu btb btc btd bte bti btr bts btt btu bub buc bud bue bui bur bus but buu c-- cbb cbc cbd cbe cbi cbr cbs cbt cbu ccb ccc ccd cce cci ccr ccs cct ccu cdb cdc cdd cde cdi cdr cds cdt cdu ce- ceb cec ced cee cei cer ces cet ceu ci- cib cic cid cie cii cir cis cit ciu crb crc crd cre cri crr crs crt cru csb csc csd cse csi csr css cst csu ctb ctc ctd cte cti ctr cts ctt ctu cub cuc cud cue cui cur cus cut cuu dbb dbc dbd dbe dbi dbr dbs dbt dbu dcb dcc dcd dce dci dcr dcs dct dcu ddb ddc ddd dde ddi ddr dds ddt ddu de- deb dec ded dee dei der des det deu di- dib dic did die dii dir dis dit diu drb drc drd dre dri drr drs drt dru dsb dsc dsd dse dsi dsr dss dst dsu dtb dtc dtd dte dti dtr dts dtt dtu dub duc dud due dui dur dus dut ebb ebc ebd ebe ebi ebr ebs ebt ebu ec- ecb ecc ecd ece eci ecr ecs ect ecu ed- edb edc edd ede edi edr eds edt edu eeb eec eed eee eer ees eet eib eic eid eie eii eir eis eit eiu erb erc erd ere eri err ers ert eru es- esb esc esd ese esi esr ess est esu etb etc etd ete eti etr ets ett etu eu- eub euc eud eue eui eur eus eut i-d ibb ibc ibd ibe ibi ibr ibs ibt ibu icb icc icd ice ici icr ics ict icu idb idc idd ide idi idr ids idt idu ie- iec ied iee iei ier ies iet iib iic iid iie iii iir iis iit iiu ir- irb irc ird ire iri irr irs irt iru is- isb isc isd ise isi isr iss ist isu itb itc itd ite iti its itt itu iu- iub iuc iud iue iui iur ius iut rbb rbc rbd rbe rbi rbr rbs rbt rbu rcb rcc rcd rce rci rcr rcs rct rcu rdb rdc rdd rde rdi rdr rds rdt rdu re- reb rec red ree rei rer res ret reu rib ric rid rie rii rir ris rit rrb rrc rrd rri rrr rrs rrt rru rsb rsc rsd rse rsi rsr rss rst rsu rtb rtc rtd rte rti rtr rts rtt rtu rub ruc rud rue rui rur rus rut ruu sbb sbc sbd sbe sbi sbr sbs sbt sbu scb scc scd sce sci scr scs sct scu sdb sdc sdd sde sdi sdr sds sdt sdu se- seb sec sed see sei ser ses set seu sib sic sid sie sii sir sis sit siu sr- srb src srd sre sri srr srs srt ss- ssb ssc ssd sse ssi ssr sss sst ssu stb stc std ste sti str sts stt stu sub suc sud sue sui sur sus sut suu tbb tbc tbd tbe tbi tbr tbs tbt tbu tcb tcc tcd tce tci tcr tcs tct tcu tdb tdc tdd tde tdi tdr tds tdt tdu te- teb tec ted tee tei ter tes tet teu tib tic tid tie tii tir tis tit tiu trb trc trd tre tri trr trs trt tru tsb tsc tsd tse tsi tsr tss tst tsu ttb ttc ttd tte tti ttr tts ttt ttu tub tuc tud tue tui tur tus tut tuu ubb ubc ube ubi ubr ubs ubt ubu ucb ucc ucd uce uci ucr ucs uct ucu udb udc udd ude udi udr uds udt udu ueb uec ued uee uei uer ues uet uib uic uid uie uii uir uis uit uiu ur- urb urc urd ure uri urr urs urt uru usb usc usd use usi usr uss ust usu utb utc utd ute uti utr uts utt utu uuc uue uur uus uut uuu