-er -up b-p b-u bbb bbd bbe bbn bbp bbr bbu bdb bdd bde bdp bdr bdu be- beb bed bee ben bep ber beu bnb bnd bne bnn bnp bnr bnu bpb bpd bpe bpn bpp bpr bpu brb brd bre brn brp brr bru bub bud bue bun bup bur buu dbb dbd dbe dbn dbp dbr dbu ddb ddd dde ddn ddp ddr ddu de- deb ded dee den dep der deu dnb dnd dne dnn dnp dnr dpb dpd dpe dpn dpp dpr dpu drb drd dre drn drp drr dru dub dud due dun dup dur ebb ebd ebe ebn ebp ebr ebu ed- edb edd ede edn edp edr edu eeb eed eee een eep eer en- enb end ene enn enp enr enu ep- epb epd epe epn epp epr epu erb erd ere ern erp err eru eu- eub eud eue eun eup eur nbb nbd nbe nbn nbp nbr nbu ndb ndd nde ndn ndp ndr ndu ne- neb ned nee nen nep ner neu nnb nne nnn nnp nnu npb npd npe npn npp npr npu nrb nrd nre nrn nrp nrr nru nub nud nue nun nup nur nuu p-p pbb pbd pbe pbn pbp pbr pbu pdb pdd pde pdn pdp pdr pdu peb ped pee pen pep per peu pn- pnb pnd pne pnn pnp pnr pnu ppb ppd ppe ppn ppp ppr ppu prb prd pre prn prp prr pru pub pud pue pun pup pur puu rbb rbd rbe rbn rbp rbr rbu rdb rdd rde rdn rdp rdr rdu re- reb red ree ren rep rer reu rnb rnd rnn rnp rnr rnu rpb rpd rpe rpn rpp rpr rpu rrb rrd rrn rrp rrr rru rub rud rue run rup rur ruu ubb ube ubn ubp ubr ubu udb udd ude udn udp udr udu ueb ued uee uen uep uer un- unb und une unn unp unr unu up- upb upd upe upn upp upr upu ur- urb urd ure urn urp urr uru uue uun uur uuu