-er -ic bbb bbc bbe bbi bbk bbn bbr bcb bcc bce bci bck bcn bcr be- beb bec bee bei bek ben ber bi- bib bic bie bii bik bin bir bkb bkc bke bkk bkn bkr bnb bnc bne bni bnk bnn bnr brb bre bri brk brn brr c-- cbb cbc cbe cbi cbk cbn cbr ccb ccc cce cci cck ccn ccr ce- ceb cec cee cei cek cen cer ci- cib cic cie cii cik cin cir ckb ckc cki cn- cnb cnc cne cni cnn cnr crb crc cre cri crk crn crr ebb ebc ebe ebi ebk ebn ebr ec- ecb ecc ece eci eck ecn ecr eeb eec eee eek een eer eib eic eie eii eik ein eir ekb ekc eke eki ekr en- enb enc ene eni enk enn enr erb erc ere eri erk ern err ibb ibc ibe ibi ibk ibn ibr icb icc ice ici ick icn icr ie- iec iee iei iek ien ier iib iic iie iii iin iir ikb ikc ike iki ikk ikr in- inb inc ine ini ink inn inr ir- irb irc ire iri irk irn irr kbb kbc kbe kbi kbk kbn kbr kcb kcc kce kci kck kcn kcr ke- keb kec kee kei kek ken ker kib kic kie kii kik kin kir kkb kkc kke kki kkk kkn kkr kn- knc kne kni knk knn knr krc kri krk krn krr n-i nbb nbc nbe nbi nbk nbn nbr ncb ncc nce nci nck ncn ncr ne- neb nec nee nei nek nen ner nib nic nie nii nik nin nir nkc nke nki nkk nkn nkr nnb nnc nne nni nnk nnn nrb nrc nre nri nrk nrn nrr rbb rbc rbe rbi rbk rbn rbr rcb rcc rce rci rcn rcr re- reb rec ree rei rek ren rer rib ric rie rii rik rin rir rkb rkc rke rkk rnb rnc rni rnn rnr rrb rrc rri rrk rrn rrr