-er b-p bbb bbe bbg bbi bbp bbr be- beb bee beg bei bep ber bgb bge bgg bgi bgp bgr bi- bib bie big bii bip bir bpb bpe bpg bpi bpp bpr brb bre brg bri brp brr ebb ebe ebg ebi ebp ebr eeb eee eeg eep eer egb ege egg egi egp egr eib eie eig eii eip eir ep- epb epe epg epi epp epr erb ere erg eri erp err g-p gbe gbg gbi gbp gbr ge- geb gee geg gei gep ger ggb ggg ggi ggp ggr gib gie gig gii gip gir gpb gpe gpg gpi gpp gpr grb gre grg gri grp grr ibb ibe ibg ibi ibp ibr ie- iee ieg iei iep ier igb ige igg igi igp igr iib iie iii iip iir ipb ipe ipg ipi ipp ipr ir- irb ire irg iri irp irr p-p pbb pbe pbg pbi pbp pbr peb pee peg pei pep per pgb pge pgg pgi pgp pgr pib pie pig pii pip pir ppb ppe ppg ppi ppp ppr prb pre prg pri prp prr rbb rbe rbg rbi rbp rbr re- reb ree reg rei rep rer rgb rge rgg rgi rgp rgr rib rie rig rii rip rir rpb rpe rpg rpi rpp rpr rrb rrg rri rrp rrr