-er b-p bbb bbd bbe bbg bbi bbp bbr bdb bdd bde bdg bdi bdp bdr be- beb bed bee beg bei bep ber bgb bgd bge bgg bgi bgp bgr bi- bib bid bie big bii bip bir bpb bpd bpe bpg bpi bpp bpr brb brd bre brg bri brp brr dbb dbd dbe dbg dbi dbp dbr ddb ddd dde ddg ddi ddp ddr de- deb ded dee deg dei dep der dgd dge dgg dgi dgp dgr di- dib did die dig dii dip dir dpb dpd dpe dpg dpi dpp dpr drb drd dre drg dri drp drr ebb ebd ebe ebg ebi ebp ebr ed- edb edd ede edg edi edp edr eeb eed eee eeg eep eer egb egd ege egg egi egp egr eib eid eie eig eii eip eir ep- epb epd epe epg epi epp epr erb erd ere erg eri erp err g-d g-p gbd gbe gbg gbi gbp gbr gdb gdd gde gdi gdp gdr ge- geb ged gee geg gei gep ger ggb ggd ggg ggi ggp ggr gib gid gie gig gii gip gir gpb gpd gpe gpg gpi gpp gpr grb grd gre grg gri grp grr i-d ibb ibd ibe ibg ibi ibp ibr idb idd ide idg idi idp idr ie- ied iee ieg iei iep ier igb igd ige igg igi igp igr iib iid iie iii iip iir ipb ipd ipe ipg ipi ipp ipr ir- irb ird ire irg iri irp irr p-p pbb pbd pbe pbg pbi pbp pbr pdb pdd pde pdg pdi pdp pdr peb ped pee peg pei pep per pgb pgd pge pgg pgi pgp pgr pib pid pie pig pii pip pir ppb ppd ppe ppg ppi ppp ppr prb prd pre prg pri prp prr rbb rbd rbe rbg rbi rbp rbr rdb rdd rde rdg rdi rdp rdr re- reb red ree reg rei rep rer rgb rgd rge rgg rgi rgp rgr rib rid rie rig rii rip rir rpb rpd rpe rpg rpi rpp rpr rrb rrd rrg rri rrp rrr