-er -up b-p b-u bbb bbe bbn bbo bbp bbr bbt bbu be- beb bee ben beo bep ber bet beu bnb bne bnn bno bnp bnr bnt bnu bob boe bon boo bop bor bot bou bpb bpe bpn bpo bpp bpr bpt bpu brb bre brn bro brp brr brt bru btb bte btn bto btp btr btt btu bub bue bun buo bup bur but buu ebb ebe ebn ebo ebp ebr ebt ebu eeb eee een eeo eep eer eet en- enb ene enn eno enp enr ent enu eo- eob eoe eon eoo eop eor eot eou ep- epb epe epn epo epp epr ept epu erb ere ern ero erp err ert eru etb ete etn eto etp etr ett etu eu- eub eue eun eup eur eut nbb nbe nbn nbo nbp nbr nbt nbu ne- neb nee nen neo nep ner net neu nnb nne nnn nno nnp nnt nnu no- nob noe non noo nop nor not nou npb npe npn npo npp npr npt npu nrb nre nrn nro nrp nrr nrt nru ntb nte ntn nto ntp ntr ntt ntu nub nue nun nuo nup nur nut nuu ob- obb obe obn obo obp obr obt obu oeb oee oen oeo oep oer oet on- onb one onn ono onp onr ont onu oo- oob oon ooo oop oor oot op- opb ope opn opo opp opr opt or- orb ore orn oro orp orr ort oru ot- otb ote otn oto otp otr ott otu ou- oue oun ouo oup our out p-p pbb pbe pbn pbo pbp pbr pbt pbu peb pee pen peo pep per pet peu pn- pnb pne pnn pno pnp pnr pnt pnu pob poe pon poo pop por pot pou ppb ppe ppn ppo ppp ppr ppt ppu prb pre prn pro prp prr prt pru pt- ptb pte ptn pto ptp ptr ptt ptu pub pue pun pup pur put puu rbb rbe rbn rbo rbp rbr rbt rbu re- reb ree ren reo rep rer ret reu rnb rnn rno rnp rnr rnt rnu rob roe ron roo rop ror rot rou rpb rpe rpn rpo rpp rpr rpt rpu rrb rrn rrp rrr rrt rru rtb rte rtn rto rtp rtr rtt rtu rub rue run ruo rup rur rut ruu tbb tbe tbn tbo tbp tbr tbt tbu te- teb tee ten teo tep ter tet teu tnb tne tnn tno tnp tnr tnt to- tob toe ton too top tor tot tou tpb tpe tpn tpo tpp tpr tpt tpu trb tre trn tro trp trr trt tru ttb tte ttn tto ttp ttr ttt ttu tub tue tun tuo tup tur tut tuu ubb ube ubn ubo ubp ubr ubt ubu ueb uee uen uep uer uet un- unb une unn uno unp unr unt unu uob uoe uon uoo uop uor uot up- upb upe upn upo upp upr upt upu ur- urb ure urn uro urp urr urt uru utb ute utn uto utp utr utt utu uue uun uur uut uuu