-er -ic bbb bbc bbd bbe bbi bbk bbr bcb bcc bcd bce bci bck bcr bdb bdc bdd bde bdi bdk bdr be- beb bec bed bee bei bek ber bi- bib bic bid bie bii bik bir bkb bkc bke bkk bkr brb brd bre bri brk brr c-- cbb cbc cbd cbe cbi cbk cbr ccb ccc ccd cce cci cck ccr cdb cdc cdd cde cdi cdk cdr ce- ceb cec ced cee cei cek cer ci- cib cic cid cie cii cik cir ckb ckc ckd cki crb crc crd cre cri crk crr dbb dbc dbd dbe dbi dbk dbr dcb dcc dcd dce dci dck dcr ddb ddc ddd dde ddi ddk ddr de- deb dec ded dee dei dek der di- dib dic did die dii dik dir dkb dkc dke dki dkk dkr drb drc drd dre dri drk drr ebb ebc ebd ebe ebi ebk ebr ec- ecb ecc ecd ece eci eck ecr ed- edb edc edd ede edi edk edr eeb eec eed eee eek eer eib eic eid eie eii eik eir ekb ekc ekd eke eki ekr erb erc erd ere eri erk err i-d ibb ibc ibd ibe ibi ibk ibr icb icc icd ice ici ick icr idb idc idd ide idi idk idr ie- iec ied iee iei iek ier iib iic iid iie iii iir ikb ikc ike iki ikk ikr ir- irb irc ird ire iri irk irr kbb kbc kbd kbe kbi kbk kbr kcb kcc kcd kce kci kck kcr kdb kdc kde kdk kdr ke- keb kec ked kee kei kek ker kib kic kid kie kii kik kir kkb kkc kke kki kkk kkr krc krd kri krk krr rbb rbc rbd rbe rbi rbk rbr rcb rcc rcd rce rci rcr rdb rdc rdd rde rdi rdr re- reb rec red ree rei rek rer rib ric rid rie rii rik rir rkb rkc rke rkk rrb rrc rrd rri rrk rrr