-er -ic bbb bbc bbe bbg bbh bbi bbk bbr bcb bcc bce bcg bch bci bck bcr be- beb bec bee beg beh bei bek ber bgb bgc bge bgg bgh bgi bgk bgr bhb bhc bhe bhg bhh bhi bhk bhr bi- bib bic bie big bih bii bik bir bkb bkc bke bkg bkk bkr brb bre brg brh bri brk brr c-- cbb cbc cbe cbg cbh cbi cbk cbr ccb ccc cce ccg cch cci cck ccr ce- ceb cec cee ceg ceh cei cek cer cgb cgc cge cgg cgh cgi cgr ch- chb chc che chg chh chi chk chr ci- cib cic cie cig cih cii cik cir ckb ckc ckh cki crb crc cre crg crh cri crk crr ebb ebc ebe ebg ebh ebi ebk ebr ec- ecb ecc ece ecg ech eci eck ecr eeb eec eee eeg eek eer egb egc ege egg egh egi egr ehb ehc ehe ehg ehh ehi ehr eib eic eie eig eii eik eir ekb ekc eke ekg ekh eki ekr erb erc ere erg erh eri erk err gbc gbe gbg gbh gbi gbk gbr gcb gcc gce gcg gch gci gck gcr ge- geb gec gee geg geh gei gek ger ggb ggc ggg ggh ggi ggr ghb ghc ghe ghg ghh ghi ghr gib gic gie gig gih gii gik gir gkb gkh grb grc gre grg grh gri grk grr h-i hbb hbc hbe hbg hbh hbi hbk hbr hcb hcc hce hcg hch hci hck hcr he- heb hec hee heg heh hei hek her hgb hgc hge hgg hgh hgi hgk hgr hhb hhc hhe hhg hhh hhi hhk hhr hib hic hie hig hih hii hik hir hkb hkg hkh hki hkk hkr hr- hrb hrc hre hrg hrh hri hrk hrr ibb ibc ibe ibg ibh ibi ibk ibr icb icc ice icg ich ici ick icr ie- iec iee ieg iei iek ier igb igc ige igg igh igi igk igr ihb ihc ihe ihg ihh ihi ihk ihr iib iic iie iih iii iir ikb ikc ike iki ikk ikr ir- irb irc ire irg iri irk irr kbb kbc kbe kbh kbi kbk kbr kcb kcc kce kcg kch kci kck kcr ke- keb kec kee keg keh kei kek ker kgb kgc kgh kgi khe khh khi khk khr kib kic kie kig kih kii kik kir kkb kkc kke kkh kki kkk kkr krc krg kri krk krr rbb rbc rbe rbg rbh rbi rbk rbr rcb rcc rce rcg rch rci rcr re- reb rec ree reg reh rei rek rer rgb rgc rge rgg rgh rgi rgk rgr rh- rhb rhc rhe rhg rhh rhi rhr rib ric rie rig rih rii rik rir rkb rkc rke rkg rkk rrb rrc rrg rrh rri rrk rrr