-er -ic b-u bbb bbc bbd bbe bbi bbr bbs bbu bcb bcc bcd bce bci bcr bcs bcu bdb bdc bdd bde bdi bdr bds bdu be- beb bec bed bee bei ber bes beu bi- bib bic bid bie bii bir bis biu brb brd bre bri brr brs bru bsb bsc bsd bse bsi bsr bss bsu bub buc bud bue bui bur bus buu c-- cbb cbc cbd cbe cbi cbr cbs cbu ccb ccc ccd cce cci ccr ccs ccu cdb cdc cdd cde cdi cdr cds cdu ce- ceb cec ced cee cei cer ces ceu ci- cib cic cid cie cii cir cis ciu crb crc crd cre cri crr crs cru csb csc csd cse csi csr css csu cub cuc cud cue cui cur cus cuu dbb dbc dbd dbe dbi dbr dbs dbu dcb dcc dcd dce dci dcr dcs dcu ddb ddc ddd dde ddi ddr dds ddu de- deb dec ded dee dei der des deu di- dib dic did die dii dir dis diu drb drc drd dre dri drr drs dru dsb dsc dsd dse dsi dsr dss dsu dub duc dud due dui dur dus ebb ebc ebd ebe ebi ebr ebs ebu ec- ecb ecc ecd ece eci ecr ecs ecu ed- edb edc edd ede edi edr eds edu eeb eec eed eee eer ees eib eic eid eie eii eir eis eiu erb erc erd ere eri err ers eru es- esb esc esd ese esi esr ess esu eu- eub euc eud eue eui eur eus i-d ibb ibc ibd ibe ibi ibr ibs ibu icb icc icd ice ici icr ics icu idb idc idd ide idi idr ids idu ie- iec ied iee iei ier ies iib iic iid iie iii iir iis iiu ir- irb irc ird ire iri irr irs iru is- isb isc isd ise isi isr iss isu iu- iub iuc iud iue iui iur ius rbb rbc rbd rbe rbi rbr rbs rbu rcb rcc rcd rce rci rcr rcs rcu rdb rdc rdd rde rdi rdr rds rdu re- reb rec red ree rei rer res reu rib ric rid rie rii rir ris rrb rrc rrd rri rrr rrs rru rsb rsc rsd rse rsi rsr rss rsu rub ruc rud rue rui rur rus ruu sbb sbc sbd sbe sbi sbr sbs sbu scb scc scd sce sci scr scs scu sdb sdc sdd sde sdi sdr sds sdu se- seb sec sed see sei ser ses seu sib sic sid sie sii sir sis siu sr- srb src srd sre sri srr srs ss- ssb ssc ssd sse ssi ssr sss ssu sub suc sud sue sui sur sus suu ubb ubc ube ubi ubr ubs ubu ucb ucc ucd uce uci ucr ucs ucu udb udc udd ude udi udr uds udu ueb uec ued uee uei uer ues uib uic uid uie uii uir uis uiu ur- urb urc urd ure uri urr urs uru usb usc usd use usi usr uss usu uuc uue uur uus uuu