-er -ic b-u bbb bbc bbe bbi bbk bbr bbu bcb bcc bce bci bck bcr bcu bcz be- beb bec bee bei bek ber beu bez bi- bib bic bie bii bik bir biu biz bkb bkc bke bkk bkr brb bre bri brk brr bru brz bub buc bue bui buk bur buu buz bze bzr bzu bzz c-- cbb cbc cbe cbi cbk cbr cbu cbz ccb ccc cce cci cck ccr ccu ccz ce- ceb cec cee cei cek cer ceu cez ci- cib cic cie cii cik cir ciu ckb ckc cki crb crc cre cri crk crr cru crz cub cuc cue cui cuk cur cuu cuz cz- czc cze czk ebb ebc ebe ebi ebk ebr ebu ec- ecb ecc ece eci eck ecr ecu eeb eec eee eek eer eib eic eie eii eik eir eiu ekb ekc eke eki ekr eku erb erc ere eri erk err eru erz eu- eub euc eue eui eur eze ezr ezz ibb ibc ibe ibi ibk ibr ibu ibz icb icc ice ici ick icr icu icz ie- iec iee iei iek ier iib iic iie iii iir iiu ikb ikc ike iki ikk ikr iku ir- irb irc ire iri irk irr iru iu- iub iuc iue iui iur iuz ize izi izu izz k-z kbb kbc kbe kbi kbk kbr kbu kbz kcb kcc kce kci kck kcr kcu ke- keb kec kee kei kek ker kez kib kic kie kii kik kir kiu kiz kkb kkc kke kki kkk kkr kku krc kri krk krr kru kub kuc kue kui kuk kur kuu rbb rbc rbe rbi rbk rbr rbu rcb rcc rce rci rcr rcu re- reb rec ree rei rek rer reu rez rib ric rie rii rik rir riz rkb rkc rke rkk rku rkz rrb rrc rri rrk rrr rru rub ruc rue rui ruk rur ruu ruz rzb rze ubb ubc ube ubi ubk ubr ubu ucb ucc uce uci uck ucr ucu ueb uec uee uei uer uib uic uie uii uir uiu ukb ukc uke uki ukk ukr uku ukz ur- urb urc ure uri urk urr uru urz uuc uue uur uuu uzb uzi uzu zbb zbc zbr zce zeb zec zee zek zer zez zib zie zik zir ziz zub zuc zui zuk zur zuz zzr zzz