-er -ic bbb bbc bbd bbe bbi bbo bbr bbs bcb bcc bcd bce bci bco bcr bcs bdb bdc bdd bde bdi bdo bdr bds be- beb bec bed bee bei beo ber bes bi- bib bic bid bie bii bio bir bis bob boc bod boe boi boo bor bos brb brd bre bri bro brr brs bsb bsc bsd bse bsi bso bsr bss c-- cbb cbc cbd cbe cbi cbo cbr cbs ccb ccc ccd cce cci cco ccr ccs cdb cdc cdd cde cdi cdo cdr cds ce- ceb cec ced cee cei ceo cer ces ci- cib cic cid cie cii cio cir cis co- cob coc cod coe coi coo cor cos crb crc crd cre cri cro crr crs csb csc csd cse csi cso csr css dbb dbc dbd dbe dbi dbo dbr dbs dcb dcc dcd dce dci dco dcr dcs ddb ddc ddd dde ddi ddo ddr dds de- deb dec ded dee dei deo der des di- dib dic did die dii dio dir dis dob doc dod doe doi doo dor dos drb drc drd dre dri dro drr drs dsb dsc dsd dse dsi dso dsr dss ebb ebc ebd ebe ebi ebo ebr ebs ec- ecb ecc ecd ece eci eco ecr ecs ed- edb edc edd ede edi edo edr eds eeb eec eed eee eeo eer ees eib eic eid eie eii eio eir eis eo- eob eoc eod eoe eoi eoo eor eos erb erc erd ere eri ero err ers es- esb esc esd ese esi eso esr ess i-d ibb ibc ibd ibe ibi ibo ibr ibs icb icc icd ice ici ico icr ics idb idc idd ide idi ido idr ids ie- iec ied iee iei ier ies iib iic iid iie iii iio iir iis io- iob ioc iod ioe ioi ioo ior ios ir- irb irc ird ire iri iro irr irs is- isb isc isd ise isi iso isr iss o-i ob- obb obc obd obe obi obo obr obs oc- ocb occ ocd oci oco ocr ocs odb odc odd ode odi odo odr ods oeb oec oed oee oei oeo oer oes oib oic oid oie oii oio oir ois oo- oob ooc ood ooi ooo oor oos or- orb orc ord ore ori oro orr ors os- osb osc osd ose osi oso osr oss rbb rbc rbd rbe rbi rbo rbr rbs rcb rcc rcd rce rci rco rcr rcs rdb rdc rdd rde rdi rdo rdr rds re- reb rec red ree rei reo rer res rib ric rid rie rii rio rir ris rob roc rod roe roi roo ror ros rrb rrc rrd rri rrr rrs rsb rsc rsd rse rsi rso rsr rss sbb sbc sbd sbe sbi sbo sbr sbs scb scc scd sce sci sco scr scs sdb sdc sdd sde sdi sdo sdr sds se- seb sec sed see sei seo ser ses sib sic sid sie sii sio sir sis sob soc sod soe soi soo sor sos sr- srb src srd sre sri sro srr srs ss- ssb ssc ssd sse ssi sso ssr sss