-er -ic bbb bbc bbe bbi bbk bbr bcb bcc bce bci bck bcr bcz be- beb bec bee bei bek ber bez bi- bib bic bie bii bik bir biz bkb bkc bke bkk bkr brb bre bri brk brr brz bze bzr bzz c-- cbb cbc cbe cbi cbk cbr cbz ccb ccc cce cci cck ccr ccz ce- ceb cec cee cei cek cer cez ci- cib cic cie cii cik cir ckb ckc cki crb crc cre cri crk crr crz cz- czc cze czk ebb ebc ebe ebi ebk ebr ec- ecb ecc ece eci eck ecr eeb eec eee eek eer eib eic eie eii eik eir ekb ekc eke eki ekr erb erc ere eri erk err erz eze ezr ezz ibb ibc ibe ibi ibk ibr ibz icb icc ice ici ick icr icz ie- iec iee iei iek ier iib iic iie iii iir ikb ikc ike iki ikk ikr ir- irb irc ire iri irk irr ize izi izz k-z kbb kbc kbe kbi kbk kbr kbz kcb kcc kce kci kck kcr ke- keb kec kee kei kek ker kez kib kic kie kii kik kir kiz kkb kkc kke kki kkk kkr krc kri krk krr rbb rbc rbe rbi rbk rbr rcb rcc rce rci rcr re- reb rec ree rei rek rer rez rib ric rie rii rik rir riz rkb rkc rke rkk rkz rrb rrc rri rrk rrr rzb rze zbb zbc zbr zce zeb zec zee zek zer zez zib zie zik zir ziz zzr zzz