-er -ic bbb bbc bbd bbe bbi bbk bbn bbr bcb bcc bcd bce bci bck bcn bcr bdb bdc bdd bde bdi bdk bdr be- beb bec bed bee bei bek ben ber bi- bib bic bid bie bii bik bin bir bkb bkc bke bkk bkn bkr bnb bnc bnd bne bni bnk bnn bnr brb brd bre bri brk brn brr c-- cbb cbc cbd cbe cbi cbk cbn cbr ccb ccc ccd cce cci cck ccn ccr cdb cdc cdd cde cdi cdk cdn cdr ce- ceb cec ced cee cei cek cen cer ci- cib cic cid cie cii cik cin cir ckb ckc ckd cki cn- cnb cnc cnd cne cni cnn cnr crb crc crd cre cri crk crn crr dbb dbc dbd dbe dbi dbk dbn dbr dcb dcc dcd dce dci dck dcn dcr ddb ddc ddd dde ddi ddk ddn ddr de- deb dec ded dee dei dek den der di- dib dic did die dii dik din dir dkb dkc dke dki dkk dkr dnb dnc dnd dne dni dnk dnn dnr drb drc drd dre dri drk drn drr ebb ebc ebd ebe ebi ebk ebn ebr ec- ecb ecc ecd ece eci eck ecn ecr ed- edb edc edd ede edi edk edn edr eeb eec eed eee eek een eer eib eic eid eie eii eik ein eir ekb ekc ekd eke eki ekr en- enb enc end ene eni enk enn enr erb erc erd ere eri erk ern err i-d ibb ibc ibd ibe ibi ibk ibn ibr icb icc icd ice ici ick icn icr idb idc idd ide idi idk idn idr ie- iec ied iee iei iek ien ier iib iic iid iie iii iin iir ikb ikc ike iki ikk ikr in- inb inc ind ine ini ink inn inr ir- irb irc ird ire iri irk irn irr kbb kbc kbd kbe kbi kbk kbn kbr kcb kcc kcd kce kci kck kcn kcr kdb kdc kde kdk kdr ke- keb kec ked kee kei kek ken ker kib kic kid kie kii kik kin kir kkb kkc kke kki kkk kkn kkr kn- knc knd kne kni knk knn knr krc krd kri krk krn krr n-i nbb nbc nbd nbe nbi nbk nbn nbr ncb ncc ncd nce nci nck ncn ncr ndb ndc ndd nde ndi ndk ndn ndr ne- neb nec ned nee nei nek nen ner nib nic nid nie nii nik nin nir nkc nke nki nkk nkn nkr nnb nnc nne nni nnk nnn nrb nrc nrd nre nri nrk nrn nrr rbb rbc rbd rbe rbi rbk rbn rbr rcb rcc rcd rce rci rcn rcr rdb rdc rdd rde rdi rdn rdr re- reb rec red ree rei rek ren rer rib ric rid rie rii rik rin rir rkb rkc rke rkk rnb rnc rnd rni rnn rnr rrb rrc rrd rri rrk rrn rrr