-er -ic bbb bbc bbd bbe bbi bbr bbs bbt bcb bcc bcd bce bci bcr bcs bct bdb bdc bdd bde bdi bdr bds bdt be- beb bec bed bee bei ber bes bet bi- bib bic bid bie bii bir bis bit brb brd bre bri brr brs brt bsb bsc bsd bse bsi bsr bss bst btb btc btd bte bti btr bts btt c-- cbb cbc cbd cbe cbi cbr cbs cbt ccb ccc ccd cce cci ccr ccs cct cdb cdc cdd cde cdi cdr cds cdt ce- ceb cec ced cee cei cer ces cet ci- cib cic cid cie cii cir cis cit crb crc crd cre cri crr crs crt csb csc csd cse csi csr css cst ctb ctc ctd cte cti ctr cts ctt dbb dbc dbd dbe dbi dbr dbs dbt dcb dcc dcd dce dci dcr dcs dct ddb ddc ddd dde ddi ddr dds ddt de- deb dec ded dee dei der des det di- dib dic did die dii dir dis dit drb drc drd dre dri drr drs drt dsb dsc dsd dse dsi dsr dss dst dtb dtc dtd dte dti dtr dts dtt ebb ebc ebd ebe ebi ebr ebs ebt ec- ecb ecc ecd ece eci ecr ecs ect ed- edb edc edd ede edi edr eds edt eeb eec eed eee eer ees eet eib eic eid eie eii eir eis eit erb erc erd ere eri err ers ert es- esb esc esd ese esi esr ess est etb etc etd ete eti etr ets ett i-d ibb ibc ibd ibe ibi ibr ibs ibt icb icc icd ice ici icr ics ict idb idc idd ide idi idr ids idt ie- iec ied iee iei ier ies iet iib iic iid iie iii iir iis iit ir- irb irc ird ire iri irr irs irt is- isb isc isd ise isi isr iss ist itb itc itd ite iti its itt rbb rbc rbd rbe rbi rbr rbs rbt rcb rcc rcd rce rci rcr rcs rct rdb rdc rdd rde rdi rdr rds rdt re- reb rec red ree rei rer res ret rib ric rid rie rii rir ris rit rrb rrc rrd rri rrr rrs rrt rsb rsc rsd rse rsi rsr rss rst rtb rtc rtd rte rti rtr rts rtt sbb sbc sbd sbe sbi sbr sbs sbt scb scc scd sce sci scr scs sct sdb sdc sdd sde sdi sdr sds sdt se- seb sec sed see sei ser ses set sib sic sid sie sii sir sis sit sr- srb src srd sre sri srr srs srt ss- ssb ssc ssd sse ssi ssr sss sst stb stc std ste sti str sts stt tbb tbc tbd tbe tbi tbr tbs tbt tcb tcc tcd tce tci tcr tcs tct tdb tdc tdd tde tdi tdr tds tdt te- teb tec ted tee tei ter tes tet tib tic tid tie tii tir tis tit trb trc trd tre tri trr trs trt tsb tsc tsd tse tsi tsr tss tst ttb ttc ttd tte tti ttr tts ttt