-er -ic bbb bbc bbe bbi bbk bbr bbs bcb bcc bce bci bck bcr bcs bcv be- beb bec bee bei bek ber bes bev bi- bib bic bie bii bik bir bis biv bkb bkc bke bkk bkr bks bkv brb bre bri brk brr brs brv bsb bsc bse bsi bsk bsr bss bsv bvb bvc bve bvi bvk bvr bvs bvv c-- cbb cbc cbe cbi cbk cbr cbs cbv ccb ccc cce cci cck ccr ccs ccv ce- ceb cec cee cei cek cer ces cev ci- cib cic cie cii cik cir cis civ ckb ckc cki cks crb crc cre cri crk crr crs crv csb csc cse csi csk csr css csv cvb cvc cve cvi cvk cvr cvs cvv ebb ebc ebe ebi ebk ebr ebs ebv ec- ecb ecc ece eci eck ecr ecs ecv eeb eec eee eek eer ees eev eib eic eie eii eik eir eis eiv ekb ekc eke eki ekr eks ekv erb erc ere eri erk err ers erv es- esb esc ese esi esk esr ess esv evb evc eve evi evr evs evv i-v ibb ibc ibe ibi ibk ibr ibs ibv icb icc ice ici ick icr ics icv ie- iec iee iei iek ier ies iev iib iic iie iii iir iis ikb ikc ike iki ikk ikr iks ikv ir- irb irc ire iri irk irr irs irv is- isb isc ise isi isk isr iss isv ivb ivc ive ivi ivr ivs ivv kbb kbc kbe kbi kbk kbr kbs kcb kcc kce kci kck kcr kcs ke- keb kec kee kei kek ker kes kev kib kic kie kii kik kir kis kiv kkb kkc kke kki kkk kkr kks kkv krc kri krk krr krs krv ksb ksc kse ksi ksk ksr kss ksv kvb kvi kvk kvr kvs kvv rbb rbc rbe rbi rbk rbr rbs rcb rcc rce rci rcr rcs rcv re- reb rec ree rei rek rer res rev rib ric rie rii rik rir ris riv rkb rkc rke rkk rks rkv rrb rrc rri rrk rrr rrs rsb rsc rse rsi rsk rsr rss rsv rvb rvc rve rvi rvr rvs rvv sbb sbc sbe sbi sbk sbr sbs sbv scb scc sce sci sck scr scs scv se- seb sec see sei sek ser ses sev sib sic sie sii sik sir sis siv sk- skb skc ske ski skk skr sks sr- srb src sre sri srk srr srs srv ss- ssb ssc sse ssi ssk ssr sss ssv svb svc sve svi svk svr svs svv v-e vbc vbi vbk vbr vbs vbv vcc vce vci vcr vcs veb vec vee vei vek ver ves vi- vib vic vie vii vik vir vis viv vkb vrb vrc vre vri vrk vrr vrs vsb vsc vse vsi vsk vsr vss vsv vvb vvc vvi vvr vvs vvv