-er -ic bbb bbc bbe bbh bbi bbk bbr bcb bcc bce bch bci bck bcr be- beb bec bee beh bei bek ber bhb bhc bhe bhh bhi bhk bhr bi- bib bic bie bih bii bik bir bkb bkc bke bkk bkr brb bre brh bri brk brr c-- cbb cbc cbe cbh cbi cbk cbr ccb ccc cce cch cci cck ccr ce- ceb cec cee ceh cei cek cer ch- chb chc che chh chi chk chr ci- cib cic cie cih cii cik cir ckb ckc ckh cki crb crc cre crh cri crk crr ebb ebc ebe ebh ebi ebk ebr ec- ecb ecc ece ech eci eck ecr eeb eec eee eek eer ehb ehc ehe ehh ehi ehr eib eic eie eii eik eir ekb ekc eke ekh eki ekr erb erc ere erh eri erk err h-i hbb hbc hbe hbh hbi hbk hbr hcb hcc hce hch hci hck hcr he- heb hec hee heh hei hek her hhb hhc hhe hhh hhi hhk hhr hib hic hie hih hii hik hir hkb hkh hki hkk hkr hr- hrb hrc hre hrh hri hrk hrr ibb ibc ibe ibh ibi ibk ibr icb icc ice ich ici ick icr ie- iec iee iei iek ier ihb ihc ihe ihh ihi ihk ihr iib iic iie iih iii iir ikb ikc ike iki ikk ikr ir- irb irc ire iri irk irr kbb kbc kbe kbh kbi kbk kbr kcb kcc kce kch kci kck kcr ke- keb kec kee keh kei kek ker khe khh khi khk khr kib kic kie kih kii kik kir kkb kkc kke kkh kki kkk kkr krc kri krk krr rbb rbc rbe rbh rbi rbk rbr rcb rcc rce rch rci rcr re- reb rec ree reh rei rek rer rh- rhb rhc rhe rhh rhi rhr rib ric rie rih rii rik rir rkb rkc rke rkk rrb rrc rrh rri rrk rrr