-er b-p bbb bbd bbe bbn bbo bbp bbr bdb bdd bde bdo bdp bdr be- beb bed bee ben beo bep ber bnb bnd bne bnn bno bnp bnr bob bod boe bon boo bop bor bpb bpd bpe bpn bpo bpp bpr brb brd bre brn bro brp brr dbb dbd dbe dbn dbo dbp dbr ddb ddd dde ddn ddo ddp ddr de- deb ded dee den deo dep der dnb dnd dne dnn dno dnp dnr dob dod doe don doo dop dor dpb dpd dpe dpn dpo dpp dpr drb drd dre drn dro drp drr ebb ebd ebe ebn ebo ebp ebr ed- edb edd ede edn edo edp edr eeb eed eee een eeo eep eer en- enb end ene enn eno enp enr eo- eob eod eoe eon eoo eop eor ep- epb epd epe epn epo epp epr erb erd ere ern ero erp err nbb nbd nbe nbn nbo nbp nbr ndb ndd nde ndn ndo ndp ndr ne- neb ned nee nen neo nep ner nnb nne nnn nno nnp no- nob nod noe non noo nop nor npb npd npe npn npo npp npr nrb nrd nre nrn nro nrp nrr ob- obb obd obe obn obo obp obr odb odd ode odn odo odp odr oeb oed oee oen oeo oep oer on- onb ond one onn ono onp onr oo- oob ood oon ooo oop oor op- opb opd ope opn opo opp opr or- orb ord ore orn oro orp orr p-p pbb pbd pbe pbn pbo pbp pbr pdb pdd pde pdn pdo pdp pdr peb ped pee pen peo pep per pn- pnb pnd pne pnn pno pnp pnr pob pod poe pon poo pop por ppb ppd ppe ppn ppo ppp ppr prb prd pre prn pro prp prr rbb rbd rbe rbn rbo rbp rbr rdb rdd rde rdn rdo rdp rdr re- reb red ree ren reo rep rer rnb rnd rnn rno rnp rnr rob rod roe ron roo rop ror rpb rpd rpe rpn rpo rpp rpr rrb rrd rrn rrp rrr