-er -ic bbb bbc bbd bbe bbi bbr bbs bcb bcc bcd bce bci bcr bcs bdb bdc bdd bde bdi bdr bds be- beb bec bed bee bei ber bes bi- bib bic bid bie bii bir bis brb brd bre bri brr brs bsb bsc bsd bse bsi bsr bss c-- cbb cbc cbd cbe cbi cbr cbs ccb ccc ccd cce cci ccr ccs cdb cdc cdd cde cdi cdr cds ce- ceb cec ced cee cei cer ces ci- cib cic cid cie cii cir cis crb crc crd cre cri crr crs csb csc csd cse csi csr css dbb dbc dbd dbe dbi dbr dbs dcb dcc dcd dce dci dcr dcs ddb ddc ddd dde ddi ddr dds de- deb dec ded dee dei der des di- dib dic did die dii dir dis drb drc drd dre dri drr drs dsb dsc dsd dse dsi dsr dss ebb ebc ebd ebe ebi ebr ebs ec- ecb ecc ecd ece eci ecr ecs ed- edb edc edd ede edi edr eds eeb eec eed eee eer ees eib eic eid eie eii eir eis erb erc erd ere eri err ers es- esb esc esd ese esi esr ess i-d ibb ibc ibd ibe ibi ibr ibs icb icc icd ice ici icr ics idb idc idd ide idi idr ids ie- iec ied iee iei ier ies iib iic iid iie iii iir iis ir- irb irc ird ire iri irr irs is- isb isc isd ise isi isr iss rbb rbc rbd rbe rbi rbr rbs rcb rcc rcd rce rci rcr rcs rdb rdc rdd rde rdi rdr rds re- reb rec red ree rei rer res rib ric rid rie rii rir ris rrb rrc rrd rri rrr rrs rsb rsc rsd rse rsi rsr rss sbb sbc sbd sbe sbi sbr sbs scb scc scd sce sci scr scs sdb sdc sdd sde sdi sdr sds se- seb sec sed see sei ser ses sib sic sid sie sii sir sis sr- srb src srd sre sri srr srs ss- ssb ssc ssd sse ssi ssr sss