-er -ic bbb bbc bbe bbi bbk bbo bbr bcb bcc bce bci bck bco bcr bcz be- beb bec bee bei bek beo ber bez bi- bib bic bie bii bik bio bir biz bkb bkc bke bkk bko bkr bob boc boe boi bok boo bor boz brb bre bri brk bro brr brz bze bzo bzr bzz c-- cbb cbc cbe cbi cbk cbo cbr cbz ccb ccc cce cci cck cco ccr ccz ce- ceb cec cee cei cek ceo cer cez ci- cib cic cie cii cik cio cir ckb ckc cki cko co- cob coc coe coi cok coo cor coz crb crc cre cri crk cro crr crz cz- czc cze czk czo ebb ebc ebe ebi ebk ebo ebr ec- ecb ecc ece eci eck eco ecr eeb eec eee eek eeo eer eib eic eie eii eik eio eir ekb ekc eke eki eko ekr eo- eob eoc eoe eoi eok eoo eor erb erc ere eri erk ero err erz eze ezo ezr ezz ibb ibc ibe ibi ibk ibo ibr ibz icb icc ice ici ick ico icr icz ie- iec iee iei iek ier iib iic iie iii iio iir ikb ikc ike iki ikk iko ikr io- iob ioc ioe ioi ioo ior ir- irb irc ire iri irk iro irr ize izi izo izz k-z kbb kbc kbe kbi kbk kbo kbr kbz kcb kcc kce kci kck kcr ke- keb kec kee kei kek keo ker kez kib kic kie kii kik kio kir kiz kkb kkc kke kki kkk kkr kob koc koe koi kok koo kor koz krc kri krk kro krr kzo o-i ob- obb obc obe obi obk obo obr oc- ocb occ oci ock oco ocr ocz oeb oec oee oei oeo oer oib oic oie oii oik oio oir oiz okb okc oke oki okk oko okr oo- oob ooc ooi ook ooo oor or- orb orc ore ori ork oro orr orz oze ozo ozz rbb rbc rbe rbi rbk rbo rbr rcb rcc rce rci rco rcr re- reb rec ree rei rek reo rer rez rib ric rie rii rik rio rir riz rkb rkc rke rkk rko rkz rob roc roe roi rok roo ror roz rrb rrc rri rrk rrr rzb rze rzo zbb zbc zbr zce zco zeb zec zee zek zeo zer zez zib zie zik zio zir ziz zo- zob zoc zoe zoi zok zoo zor zro zzr zzz