-er -ic bbb bbc bbe bbi bbk bbl bbr bcb bcc bce bci bck bcl bcr be- beb bec bee bei bek bel ber bi- bib bic bie bii bik bil bir bkb bkc bke bkk bkl bkr blb blc ble bli blk bll blr brb bre bri brk brl brr c-- cbb cbc cbe cbi cbk cbl cbr ccb ccc cce cci cck ccl ccr ce- ceb cec cee cei cek cel cer ci- cib cic cie cii cik cil cir ckb ckc cki cl- clb clc cle cli clk cll clr crb crc cre cri crk crl crr ebb ebc ebe ebi ebk ebl ebr ec- ecb ecc ece eci eck ecl ecr eeb eec eee eek eel eer eib eic eie eii eik eil eir ekb ekc eke eki ekl ekr elb elc ele eli elk ell elr erb erc ere eri erk erl err ibb ibc ibe ibi ibk ibl ibr icb icc ice ici ick icl icr ie- iec iee iei iek iel ier iib iic iie iii iil iir ikb ikc ike iki ikk ikl ikr il- ilb ilc ile ili ilk ill ilr ir- irb irc ire iri irk irl irr kbb kbc kbe kbi kbk kbl kbr kcb kcc kce kci kck kcl kcr ke- keb kec kee kei kek kel ker kib kic kie kii kik kil kir kkb kkc kke kki kkk kkl kkr kl- klb klc kli klr krc kri krk krl krr lbb lbc lbe lbi lbk lbl lbr lcb lcc lce lci lck lcl lcr leb lec lee lei lek lel ler lib lic lie lii lik lil lir lkb lkl lkr llb llc lle lli llk lll llr lrb lrc lri lrk lrr rbb rbc rbe rbi rbk rbl rbr rcb rcc rce rci rcl rcr re- reb rec ree rei rek rel rer rib ric rie rii rik ril rir rkb rkc rke rkk rlc rle rli rll rlr rrb rrc rri rrk rrl rrr