-er b-p bbb bbe bbg bbi bbk bbp bbr be- beb bee beg bei bek bep ber bgb bge bgg bgi bgk bgp bgr bi- bib bie big bii bik bip bir bkb bke bkg bkk bkp bkr bpb bpe bpg bpi bpp bpr brb bre brg bri brk brp brr ebb ebe ebg ebi ebk ebp ebr eeb eee eeg eek eep eer egb ege egg egi egp egr eib eie eig eii eik eip eir ekb eke ekg eki ekp ekr ep- epb epe epg epi epp epr erb ere erg eri erk erp err g-p gbe gbg gbi gbk gbp gbr ge- geb gee geg gei gek gep ger ggb ggg ggi ggp ggr gib gie gig gii gik gip gir gkb gkp gpb gpe gpg gpi gpk gpp gpr grb gre grg gri grk grp grr ibb ibe ibg ibi ibk ibp ibr ie- iee ieg iei iek iep ier igb ige igg igi igk igp igr iib iie iii iip iir ikb ike iki ikk ikr ipb ipe ipg ipi ipp ipr ir- irb ire irg iri irk irp irr kbb kbe kbi kbk kbp kbr ke- keb kee keg kei kek kep ker kgb kgi kgp kib kie kig kii kik kip kir kkb kke kki kkk kkp kkr kpe kpi kpk kpp kpr krg kri krk krp krr p-p pbb pbe pbg pbi pbk pbp pbr peb pee peg pei pek pep per pgb pge pgg pgi pgk pgp pgr pib pie pig pii pik pip pir pkb pke pkg pki pkp pkr ppb ppe ppg ppi ppk ppp ppr prb pre prg pri prk prp prr rbb rbe rbg rbi rbk rbp rbr re- reb ree reg rei rek rep rer rgb rge rgg rgi rgk rgp rgr rib rie rig rii rik rip rir rkb rke rkg rkk rkp rpb rpe rpg rpi rpk rpp rpr rrb rrg rri rrk rrp rrr