-er -ic bbb bbc bbe bbi bbo bbr bbs bcb bcc bce bci bco bcr bcs be- beb bec bee bei beo ber bes bi- bib bic bie bii bio bir bis bob boc boe boi boo bor bos brb bre bri bro brr brs bsb bsc bse bsi bso bsr bss c-- cbb cbc cbe cbi cbo cbr cbs ccb ccc cce cci cco ccr ccs ce- ceb cec cee cei ceo cer ces ci- cib cic cie cii cio cir cis co- cob coc coe coi coo cor cos crb crc cre cri cro crr crs csb csc cse csi cso csr css ebb ebc ebe ebi ebo ebr ebs ec- ecb ecc ece eci eco ecr ecs eeb eec eee eeo eer ees eib eic eie eii eio eir eis eo- eob eoc eoe eoi eoo eor eos erb erc ere eri ero err ers es- esb esc ese esi eso esr ess ibb ibc ibe ibi ibo ibr ibs icb icc ice ici ico icr ics ie- iec iee iei ier ies iib iic iie iii iio iir iis io- iob ioc ioe ioi ioo ior ios ir- irb irc ire iri iro irr irs is- isb isc ise isi iso isr iss o-i ob- obb obc obe obi obo obr obs oc- ocb occ oci oco ocr ocs oeb oec oee oei oeo oer oes oib oic oie oii oio oir ois oo- oob ooc ooi ooo oor oos or- orb orc ore ori oro orr ors os- osb osc ose osi oso osr oss rbb rbc rbe rbi rbo rbr rbs rcb rcc rce rci rco rcr rcs re- reb rec ree rei reo rer res rib ric rie rii rio rir ris rob roc roe roi roo ror ros rrb rrc rri rrr rrs rsb rsc rse rsi rso rsr rss sbb sbc sbe sbi sbo sbr sbs scb scc sce sci sco scr scs se- seb sec see sei seo ser ses sib sic sie sii sio sir sis sob soc soe soi soo sor sos sr- srb src sre sri sro srr srs ss- ssb ssc sse ssi sso ssr sss