-er -ic bbb bbc bbe bbi bbn bbr bcb bcc bce bci bcn bcr be- beb bec bee bei ben ber bi- bib bic bie bii bin bir bnb bnc bne bni bnn bnr brb bre bri brn brr c-- cbb cbc cbe cbi cbn cbr ccb ccc cce cci ccn ccr ce- ceb cec cee cei cen cer ci- cib cic cie cii cin cir cn- cnb cnc cne cni cnn cnr crb crc cre cri crn crr ebb ebc ebe ebi ebn ebr ec- ecb ecc ece eci ecn ecr eeb eec eee een eer eib eic eie eii ein eir en- enb enc ene eni enn enr erb erc ere eri ern err ibb ibc ibe ibi ibn ibr icb icc ice ici icn icr ie- iec iee iei ien ier iib iic iie iii iin iir in- inb inc ine ini inn inr ir- irb irc ire iri irn irr n-i nbb nbc nbe nbi nbn nbr ncb ncc nce nci ncn ncr ne- neb nec nee nei nen ner nib nic nie nii nin nir nnb nnc nne nni nnn nrb nrc nre nri nrn nrr rbb rbc rbe rbi rbn rbr rcb rcc rce rci rcn rcr re- reb rec ree rei ren rer rib ric rie rii rin rir rnb rnc rni rnn rnr rrb rrc rri rrn rrr