-er -ic bbb bbc bbe bbg bbi bbk bbn bbr bcb bcc bce bcg bci bck bcn bcr be- beb bec bee beg bei bek ben ber bgb bgc bge bgg bgi bgk bgn bgr bi- bib bic bie big bii bik bin bir bkb bkc bke bkg bkk bkn bkr bnb bnc bne bng bni bnk bnn bnr brb bre brg bri brk brn brr c-- cbb cbc cbe cbg cbi cbk cbn cbr ccb ccc cce ccg cci cck ccn ccr ce- ceb cec cee ceg cei cek cen cer cgb cgc cge cgg cgi cgn cgr ci- cib cic cie cig cii cik cin cir ckb ckc cki cn- cnb cnc cne cng cni cnn cnr crb crc cre crg cri crk crn crr ebb ebc ebe ebg ebi ebk ebn ebr ec- ecb ecc ece ecg eci eck ecn ecr eeb eec eee eeg eek een eer egb egc ege egg egi egn egr eib eic eie eig eii eik ein eir ekb ekc eke ekg eki ekr en- enb enc ene eng eni enk enn enr erb erc ere erg eri erk ern err gbc gbe gbg gbi gbk gbn gbr gcb gcc gce gcg gci gck gcn gcr ge- geb gec gee geg gei gek gen ger ggb ggc ggg ggi ggn ggr gib gic gie gig gii gik gin gir gkb gkn gnb gnc gne gni gnn gnr grb grc gre grg gri grk grn grr ibb ibc ibe ibg ibi ibk ibn ibr icb icc ice icg ici ick icn icr ie- iec iee ieg iei iek ien ier igb igc ige igg igi igk ign igr iib iic iie iii iin iir ikb ikc ike iki ikk ikr in- inb inc ine ing ini ink inn inr ir- irb irc ire irg iri irk irn irr kbb kbc kbe kbi kbk kbn kbr kcb kcc kce kcg kci kck kcn kcr ke- keb kec kee keg kei kek ken ker kgb kgc kgi kib kic kie kig kii kik kin kir kkb kkc kke kki kkk kkn kkr kn- knc kne kng kni knk knn knr krc krg kri krk krn krr n-i nbb nbc nbe nbg nbi nbk nbn nbr ncb ncc nce ncg nci nck ncn ncr ne- neb nec nee neg nei nek nen ner ngb ngc nge ngg ngi ngk ngn nib nic nie nig nii nik nin nir nkc nke nki nkk nkn nkr nnb nnc nne nng nni nnk nnn nrb nrc nre nrg nri nrk nrn nrr rbb rbc rbe rbg rbi rbk rbn rbr rcb rcc rce rcg rci rcn rcr re- reb rec ree reg rei rek ren rer rgb rgc rge rgg rgi rgk rgn rgr rib ric rie rig rii rik rin rir rkb rkc rke rkg rkk rnb rnc rng rni rnn rnr rrb rrc rrg rri rrk rrn rrr