-er -ic bbb bbc bbe bbi bbn bbr bbs bbt bcb bcc bce bci bcn bcr bcs bct be- beb bec bee bei ben ber bes bet bi- bib bic bie bii bin bir bis bit bnb bnc bne bni bnn bnr bns bnt brb bre bri brn brr brs brt bsb bsc bse bsi bsn bsr bss bst btb btc bte bti btn btr bts btt c-- cbb cbc cbe cbi cbn cbr cbs cbt ccb ccc cce cci ccn ccr ccs cct ce- ceb cec cee cei cen cer ces cet ci- cib cic cie cii cin cir cis cit cn- cnb cnc cne cni cnn cnr cns cnt crb crc cre cri crn crr crs crt csb csc cse csi csn csr css cst ctb ctc cte cti ctn ctr cts ctt ebb ebc ebe ebi ebn ebr ebs ebt ec- ecb ecc ece eci ecn ecr ecs ect eeb eec eee een eer ees eet eib eic eie eii ein eir eis eit en- enb enc ene eni enn enr ens ent erb erc ere eri ern err ers ert es- esb esc ese esi esn esr ess est etb etc ete eti etn etr ets ett ibb ibc ibe ibi ibn ibr ibs ibt icb icc ice ici icn icr ics ict ie- iec iee iei ien ier ies iet iib iic iie iii iin iir iis iit in- inb inc ine ini inn inr ins int ir- irb irc ire iri irn irr irs irt is- isb isc ise isi isn isr iss ist itb itc ite iti itn its itt n-i nbb nbc nbe nbi nbn nbr nbs nbt ncb ncc nce nci ncn ncr ncs nct ne- neb nec nee nei nen ner nes net nib nic nie nii nin nir nis nit nnb nnc nne nni nnn nns nnt nrb nrc nre nri nrn nrr nrs nrt nsb nsc nse nsi nsn nsr nss nst ntb ntc nte nti ntn ntr nts ntt rbb rbc rbe rbi rbn rbr rbs rbt rcb rcc rce rci rcn rcr rcs rct re- reb rec ree rei ren rer res ret rib ric rie rii rin rir ris rit rnb rnc rni rnn rnr rns rnt rrb rrc rri rrn rrr rrs rrt rsb rsc rse rsi rsn rsr rss rst rtb rtc rte rti rtn rtr rts rtt sbb sbc sbe sbi sbn sbr sbs sbt scb scc sce sci scn scr scs sct se- seb sec see sei sen ser ses set sib sic sie sii sin sir sis sit snb snc sne sni snn snr sns snt sr- srb src sre sri srn srr srs srt ss- ssb ssc sse ssi ssn ssr sss sst stb stc ste sti stn str sts stt tbb tbc tbe tbi tbn tbr tbs tbt tcb tcc tce tci tcn tcr tcs tct te- teb tec tee tei ten ter tes tet tib tic tie tii tin tir tis tit tnb tnc tne tni tnn tnr tns tnt trb trc tre tri trn trr trs trt tsb tsc tse tsi tsn tsr tss tst ttb ttc tte tti ttn ttr tts ttt