-er -ic b-u bbb bbc bbe bbi bbn bbr bbs bbu bcb bcc bce bci bcn bcr bcs bcu be- beb bec bee bei ben ber bes beu bi- bib bic bie bii bin bir bis biu bnb bnc bne bni bnn bnr bns bnu brb bre bri brn brr brs bru bsb bsc bse bsi bsn bsr bss bsu bub buc bue bui bun bur bus buu c-- cbb cbc cbe cbi cbn cbr cbs cbu ccb ccc cce cci ccn ccr ccs ccu ce- ceb cec cee cei cen cer ces ceu ci- cib cic cie cii cin cir cis ciu cn- cnb cnc cne cni cnn cnr cns cnu crb crc cre cri crn crr crs cru csb csc cse csi csn csr css csu cub cuc cue cui cun cur cus cuu ebb ebc ebe ebi ebn ebr ebs ebu ec- ecb ecc ece eci ecn ecr ecs ecu eeb eec eee een eer ees eib eic eie eii ein eir eis eiu en- enb enc ene eni enn enr ens enu erb erc ere eri ern err ers eru es- esb esc ese esi esn esr ess esu eu- eub euc eue eui eun eur eus ibb ibc ibe ibi ibn ibr ibs ibu icb icc ice ici icn icr ics icu ie- iec iee iei ien ier ies iib iic iie iii iin iir iis iiu in- inb inc ine ini inn inr ins inu ir- irb irc ire iri irn irr irs iru is- isb isc ise isi isn isr iss isu iu- iub iuc iue iui iur ius n-i nbb nbc nbe nbi nbn nbr nbs nbu ncb ncc nce nci ncn ncr ncs ncu ne- neb nec nee nei nen ner nes neu nib nic nie nii nin nir nis niu nnb nnc nne nni nnn nns nnu nrb nrc nre nri nrn nrr nrs nru nsb nsc nse nsi nsn nsr nss nsu nub nuc nue nui nun nur nus nuu rbb rbc rbe rbi rbn rbr rbs rbu rcb rcc rce rci rcn rcr rcs rcu re- reb rec ree rei ren rer res reu rib ric rie rii rin rir ris rnb rnc rni rnn rnr rns rnu rrb rrc rri rrn rrr rrs rru rsb rsc rse rsi rsn rsr rss rsu rub ruc rue rui run rur rus ruu sbb sbc sbe sbi sbn sbr sbs sbu scb scc sce sci scn scr scs scu se- seb sec see sei sen ser ses seu sib sic sie sii sin sir sis siu snb snc sne sni snn snr sns snu sr- srb src sre sri srn srr srs ss- ssb ssc sse ssi ssn ssr sss ssu sub suc sue sui sun sur sus suu ubb ubc ube ubi ubn ubr ubs ubu ucb ucc uce uci ucn ucr ucs ucu ueb uec uee uei uen uer ues uib uic uie uii uin uir uis uiu un- unb unc une uni unn unr uns unu ur- urb urc ure uri urn urr urs uru usb usc use usi usn usr uss usu uuc uue uun uur uus uuu