-er b-p bbb bbd bbe bbo bbp bbr bdb bdd bde bdo bdp bdr bdv be- beb bed bee beo bep ber bev bob bod boe boo bop bor bov bpb bpd bpe bpo bpp bpr bpv brb brd bre bro brp brr brv bvb bvd bve bvo bvp bvr bvv dbb dbd dbe dbo dbp dbr dbv ddb ddd dde ddo ddp ddr de- deb ded dee deo dep der dev dob dod doe doo dop dor dov dpb dpd dpe dpo dpp dpr dpv drb drd dre dro drp drr drv dvb dvd dve dvp dvr ebb ebd ebe ebo ebp ebr ebv ed- edb edd ede edo edp edr eeb eed eee eeo eep eer eev eo- eob eod eoe eoo eop eor ep- epb epd epe epo epp epr erb erd ere ero erp err erv evb evd eve evo evp evr evv ob- obb obd obe obo obp obr obv odb odd ode odo odp odr odv oeb oed oee oeo oep oer oo- oob ood ooo oop oor oov op- opb opd ope opo opp opr opv or- orb ord ore oro orp orr orv ov- ovb ovd ove ovo ovp ovv p-p pbb pbd pbe pbo pbp pbr pdb pdd pde pdo pdp pdr pdv peb ped pee peo pep per pev pob pod poe poo pop por pov ppb ppd ppe ppo ppp ppr ppv prb prd pre pro prp prr prv pvb pvd pve pvo pvp pvr pvv rbb rbd rbe rbo rbp rbr rdb rdd rde rdo rdp rdr rdv re- reb red ree reo rep rer rev rob rod roe roo rop ror rov rpb rpd rpe rpo rpp rpr rpv rrb rrd rrp rrr rvb rvd rve rvo rvp rvr rvv v-e vbd vbo vbr vbv vdb vdd vde vdo vdp vdr vdv veb ved vee veo vep ver vob vod voe voo vop vor vov vpb vpd vpe vpo vpp vpr vrb vrd vre vrp vrr vvb vvo vvr vvv