-er -up b-p b-u bbb bbe bbk bbn bbo bbp bbr bbt bbu be- beb bee bek ben beo bep ber bet beu bkb bke bkk bkn bko bkp bkr bkt bnb bne bnk bnn bno bnp bnr bnt bnu bob boe bok bon boo bop bor bot bou bpb bpe bpn bpo bpp bpr bpt bpu brb bre brk brn bro brp brr brt bru btb bte btk btn bto btp btr btt btu bub bue buk bun buo bup bur but buu ebb ebe ebk ebn ebo ebp ebr ebt ebu eeb eee eek een eeo eep eer eet ekb eke eko ekp ekr ekt eku en- enb ene enk enn eno enp enr ent enu eo- eob eoe eok eon eoo eop eor eot eou ep- epb epe epn epo epp epr ept epu erb ere erk ern ero erp err ert eru etb ete etk etn eto etp etr ett etu eu- eub eue eun eup eur eut k-t kbb kbe kbk kbn kbo kbp kbr kbu ke- keb kee kek ken keo kep ker ket kkb kke kkk kkn kkp kkr kkt kku kn- kne knk knn kno knp knr knt knu kob koe kok kon koo kop kor kot kou kpe kpk kpn kpo kpp kpr kpt kpu krk krn kro krp krr krt kru ktb kte ktk ktn kto ktp ktr ktt ktu kub kue kuk kun kup kur kut kuu nbb nbe nbk nbn nbo nbp nbr nbt nbu ne- neb nee nek nen neo nep ner net neu nke nkk nkn nko nkp nkr nkt nku nnb nne nnk nnn nno nnp nnt nnu no- nob noe nok non noo nop nor not nou npb npe npn npo npp npr npt npu nrb nre nrk nrn nro nrp nrr nrt nru ntb nte ntk ntn nto ntp ntr ntt ntu nub nue nuk nun nuo nup nur nut nuu ob- obb obe obk obn obo obp obr obt obu oeb oee oen oeo oep oer oet okb oke okk oko okp okr oku on- onb one onk onn ono onp onr ont onu oo- oob ook oon ooo oop oor oot op- opb ope opk opn opo opp opr opt or- orb ore ork orn oro orp orr ort oru ot- otb ote otk otn oto otp otr ott otu ou- oue ouk oun ouo oup our out p-p pbb pbe pbk pbn pbo pbp pbr pbt pbu peb pee pek pen peo pep per pet peu pkb pke pkn pko pkp pkr pkt pku pn- pnb pne pnk pnn pno pnp pnr pnt pnu pob poe pok pon poo pop por pot pou ppb ppe ppk ppn ppo ppp ppr ppt ppu prb pre prk prn pro prp prr prt pru pt- ptb pte ptk ptn pto ptp ptr ptt ptu pub pue puk pun pup pur put puu rbb rbe rbk rbn rbo rbp rbr rbt rbu re- reb ree rek ren reo rep rer ret reu rkb rke rkk rko rkp rkt rku rnb rnn rno rnp rnr rnt rnu rob roe rok ron roo rop ror rot rou rpb rpe rpk rpn rpo rpp rpr rpt rpu rrb rrk rrn rrp rrr rrt rru rtb rte rtk rtn rto rtp rtr rtt rtu rub rue ruk run ruo rup rur rut ruu tbb tbe tbk tbn tbo tbp tbr tbt tbu te- teb tee tek ten teo tep ter tet teu tkb tke tkk tko tkp tkr tkt tnb tne tnk tnn tno tnp tnr tnt to- tob toe tok ton too top tor tot tou tpb tpe tpk tpn tpo tpp tpr tpt tpu trb tre trk trn tro trp trr trt tru ttb tte ttk ttn tto ttp ttr ttt ttu tub tue tuk tun tuo tup tur tut tuu ubb ube ubk ubn ubo ubp ubr ubt ubu ueb uee uen uep uer uet ukb uke ukk ukn ukp ukr uku un- unb une unk unn uno unp unr unt unu uob uoe uok uon uoo uop uor uot up- upb upe upk upn upo upp upr upt upu ur- urb ure urk urn uro urp urr urt uru utb ute utk utn uto utp utr utt utu uue uun uur uut uuu