-er -ic bbb bbc bbe bbg bbi bbk bbr bcb bcc bce bcg bci bck bcr be- beb bec bee beg bei bek ber bgb bgc bge bgg bgi bgk bgr bi- bib bic bie big bii bik bir bkb bkc bke bkg bkk bkr brb bre brg bri brk brr c-- cbb cbc cbe cbg cbi cbk cbr ccb ccc cce ccg cci cck ccr ce- ceb cec cee ceg cei cek cer cgb cgc cge cgg cgi cgr ci- cib cic cie cig cii cik cir ckb ckc cki crb crc cre crg cri crk crr ebb ebc ebe ebg ebi ebk ebr ec- ecb ecc ece ecg eci eck ecr eeb eec eee eeg eek eer egb egc ege egg egi egr eib eic eie eig eii eik eir ekb ekc eke ekg eki ekr erb erc ere erg eri erk err gbc gbe gbg gbi gbk gbr gcb gcc gce gcg gci gck gcr ge- geb gec gee geg gei gek ger ggb ggc ggg ggi ggr gib gic gie gig gii gik gir gkb grb grc gre grg gri grk grr ibb ibc ibe ibg ibi ibk ibr icb icc ice icg ici ick icr ie- iec iee ieg iei iek ier igb igc ige igg igi igk igr iib iic iie iii iir ikb ikc ike iki ikk ikr ir- irb irc ire irg iri irk irr kbb kbc kbe kbi kbk kbr kcb kcc kce kcg kci kck kcr ke- keb kec kee keg kei kek ker kgb kgc kgi kib kic kie kig kii kik kir kkb kkc kke kki kkk kkr krc krg kri krk krr rbb rbc rbe rbg rbi rbk rbr rcb rcc rce rcg rci rcr re- reb rec ree reg rei rek rer rgb rgc rge rgg rgi rgk rgr rib ric rie rig rii rik rir rkb rkc rke rkg rkk rrb rrc rrg rri rrk rrr