-er b-p bbb bbe bbf bbg bbi bbk bbn bbp bbr be- beb bee bef beg bei bek ben bep ber bfb bfe bff bfg bfi bfn bfp bfr bgb bge bgf bgg bgi bgk bgn bgp bgr bi- bib bie bif big bii bik bin bip bir bkb bke bkf bkg bkk bkn bkp bkr bnb bne bnf bng bni bnk bnn bnp bnr bpb bpe bpf bpg bpi bpn bpp bpr brb bre brf brg bri brk brn brp brr ebb ebe ebf ebg ebi ebk ebn ebp ebr eeb eee eef eeg eek een eep eer ef- efb efe eff efg efi efp efr egb ege egf egg egi egn egp egr eib eie eif eig eii eik ein eip eir ekb eke ekf ekg eki ekp ekr en- enb ene enf eng eni enk enn enp enr ep- epb epe epf epg epi epn epp epr erb ere erf erg eri erk ern erp err fbb fbe fbf fbg fbi fbk fbn fbp fbr feb fee fef feg fei fek fen fep fer ffe fff ffg ffi ffk ffn ffp ffr fgb fge fgf fgg fgi fgn fgp fgr fib fie fif fig fii fik fin fip fir fkb fkf fkg fki fkk fkp fnb fne fnf fng fni fnk fnn fnp fnr fpb fpe fpg fpi fpk fpn fpp fpr frb fre frf frg fri frk frn frp frr g-p gbe gbf gbg gbi gbk gbn gbp gbr ge- geb gee gef geg gei gek gen gep ger gfb gfe gff gfi gfk gfp gfr ggb ggg ggi ggn ggp ggr gib gie gif gig gii gik gin gip gir gkb gkn gkp gnb gne gnf gni gnn gnp gnr gpb gpe gpf gpg gpi gpk gpn gpp gpr grb gre grf grg gri grk grn grp grr i-f ibb ibe ibf ibg ibi ibk ibn ibp ibr ie- iee ief ieg iei iek ien iep ier ifb ife iff ifg ifi ifn ifp ifr igb ige igf igg igi igk ign igp igr iib iie iif iii iin iip iir ikb ike ikf iki ikk ikr in- inb ine inf ing ini ink inn inp inr ipb ipe ipf ipg ipi ipn ipp ipr ir- irb ire irf irg iri irk irn irp irr kbb kbe kbf kbi kbk kbn kbp kbr ke- keb kee kef keg kei kek ken kep ker kff kfg kfi kgb kgf kgi kgp kib kie kif kig kii kik kin kip kir kkb kke kki kkk kkn kkp kkr kn- kne knf kng kni knk knn knp knr kpe kpf kpi kpk kpn kpp kpr krf krg kri krk krn krp krr n-i nbb nbe nbf nbg nbi nbk nbn nbp nbr ne- neb nee nef neg nei nek nen nep ner nfb nfe nff nfi nfk nfn nfp nfr ngb nge ngf ngg ngi ngk ngn ngp nib nie nif nig nii nik nin nip nir nke nkf nki nkk nkn nkp nkr nnb nne nnf nng nni nnk nnn nnp npb npe npf npg npi npn npp npr nrb nre nrf nrg nri nrk nrn nrp nrr p-p pbb pbe pbf pbg pbi pbk pbn pbp pbr peb pee pef peg pei pek pen pep per pfb pfe pff pfg pfi pfk pfn pfp pfr pgb pge pgf pgg pgi pgk pgn pgp pgr pib pie pif pig pii pik pin pip pir pkb pke pkf pkg pki pkn pkp pkr pn- pnb pne pnf png pni pnk pnn pnp pnr ppb ppe ppf ppg ppi ppk ppn ppp ppr prb pre prf prg pri prk prn prp prr rbb rbe rbf rbg rbi rbk rbn rbp rbr re- reb ree ref reg rei rek ren rep rer rfb rfe rff rfg rfi rfk rfn rfp rfr rgb rge rgf rgg rgi rgk rgn rgp rgr rib rie rif rig rii rik rin rip rir rkb rke rkf rkg rkk rkp rnb rng rni rnn rnp rnr rpb rpe rpf rpg rpi rpk rpn rpp rpr rrb rrf rrg rri rrk rrn rrp rrr