-er b-p bbb bbd bbe bbg bbo bbp bbr bbx bdb bdd bde bdg bdo bdp bdr bdx be- beb bed bee beg beo bep ber bex bgb bgd bge bgg bgo bgp bgr bgx bob bod boe bog boo bop bor box bpb bpd bpe bpg bpo bpp bpr bpx brb brd bre brg bro brp brr brx bxb bxd bxo bxx dbb dbd dbe dbg dbo dbp dbr dbx ddb ddd dde ddg ddo ddp ddr ddx de- deb ded dee deg deo dep der dex dgd dge dgg dgp dgr dob dod doe dog doo dop dor dox dpb dpd dpe dpg dpo dpp dpr drb drd dre drg dro drp drr drx dxd dxo dxp dxr dxx ebb ebd ebe ebg ebo ebp ebr ebx ed- edb edd ede edg edo edp edr edx eeb eed eee eeg eeo eep eer eex egb egd ege egg ego egp egr egx eo- eob eod eoe eog eoo eop eor ep- epb epd epe epg epo epp epr epx erb erd ere erg ero erp err ex- exd exe exo exp exr exx g-d g-p gbd gbe gbg gbo gbp gbr gbx gdb gdd gde gdo gdp gdr gdx ge- geb ged gee geg geo gep ger gex ggb ggd ggg ggo ggp ggr gob god goe gog goo gop gor gox gpb gpd gpe gpg gpo gpp gpr gpx grb grd gre grg gro grp grr grx gxp ob- obb obd obe obg obo obp obr obx odb odd ode odg odo odp odr oeb oed oee oeg oeo oep oer oex ogd oge ogg ogo ogp ogx oo- oob ood oog ooo oop oor oox op- opb opd ope opg opo opp opr opx or- orb ord ore org oro orp orr orx ox- oxb oxo oxx p-p pbb pbd pbe pbg pbo pbp pbr pbx pdb pdd pde pdg pdo pdp pdr pdx peb ped pee peg peo pep per pex pgb pgd pge pgg pgo pgp pgr pob pod poe pog poo pop por pox ppb ppd ppe ppg ppo ppp ppr ppx prb prd pre prg pro prp prr prx pxe pxg pxr rbb rbd rbe rbg rbo rbp rbr rbx rdb rdd rde rdg rdo rdp rdr rdx re- reb red ree reg reo rep rer rex rgb rgd rge rgg rgo rgp rgr rgx rob rod roe rog roo rop ror rox rpb rpd rpe rpg rpo rpp rpr rpx rrb rrd rrg rrp rrr rxp rxr xbe xbr xbx xdb xde xdr xed xee xeg xep xer xex xge xgp xod xog xoo xop xor xox xpb xpd xpe xpg xpo xpp xrd xrx xxo xxp xxx