-er -up b-p b-u bbb bbe bbn bbp bbr bbt bbu be- beb bee ben bep ber bet beu bnb bne bnn bnp bnr bnt bnu bpb bpe bpn bpp bpr bpt bpu brb bre brn brp brr brt bru btb bte btn btp btr btt btu bub bue bun bup bur but buu ebb ebe ebn ebp ebr ebt ebu eeb eee een eep eer eet en- enb ene enn enp enr ent enu ep- epb epe epn epp epr ept epu erb ere ern erp err ert eru etb ete etn etp etr ett etu eu- eub eue eun eup eur eut nbb nbe nbn nbp nbr nbt nbu ne- neb nee nen nep ner net neu nnb nne nnn nnp nnt nnu npb npe npn npp npr npt npu nrb nre nrn nrp nrr nrt nru ntb nte ntn ntp ntr ntt ntu nub nue nun nup nur nut nuu p-p pbb pbe pbn pbp pbr pbt pbu peb pee pen pep per pet peu pn- pnb pne pnn pnp pnr pnt pnu ppb ppe ppn ppp ppr ppt ppu prb pre prn prp prr prt pru pt- ptb pte ptn ptp ptr ptt ptu pub pue pun pup pur put puu rbb rbe rbn rbp rbr rbt rbu re- reb ree ren rep rer ret reu rnb rnn rnp rnr rnt rnu rpb rpe rpn rpp rpr rpt rpu rrb rrn rrp rrr rrt rru rtb rte rtn rtp rtr rtt rtu rub rue run rup rur rut ruu tbb tbe tbn tbp tbr tbt tbu te- teb tee ten tep ter tet teu tnb tne tnn tnp tnr tnt tpb tpe tpn tpp tpr tpt tpu trb tre trn trp trr trt tru ttb tte ttn ttp ttr ttt ttu tub tue tun tup tur tut tuu ubb ube ubn ubp ubr ubt ubu ueb uee uen uep uer uet un- unb une unn unp unr unt unu up- upb upe upn upp upr upt upu ur- urb ure urn urp urr urt uru utb ute utn utp utr utt utu uue uun uur uut uuu