-er b-u bbb bbe bbn bbo bbr bbt bbu be- beb bee ben beo ber bet beu bnb bne bnn bno bnr bnt bnu bob boe bon boo bor bot bou brb bre brn bro brr brt bru btb bte btn bto btr btt btu bub bue bun buo bur but buu ebb ebe ebn ebo ebr ebt ebu eeb eee een eeo eer eet en- enb ene enn eno enr ent enu eo- eob eoe eon eoo eor eot eou erb ere ern ero err ert eru etb ete etn eto etr ett etu eu- eub eue eun eur eut nbb nbe nbn nbo nbr nbt nbu ne- neb nee nen neo ner net neu nnb nne nnn nno nnt nnu no- nob noe non noo nor not nou nrb nre nrn nro nrr nrt nru ntb nte ntn nto ntr ntt ntu nub nue nun nuo nur nut nuu ob- obb obe obn obo obr obt obu oeb oee oen oeo oer oet on- onb one onn ono onr ont onu oo- oob oon ooo oor oot or- orb ore orn oro orr ort oru ot- otb ote otn oto otr ott otu ou- oue oun ouo our out rbb rbe rbn rbo rbr rbt rbu re- reb ree ren reo rer ret reu rnb rnn rno rnr rnt rnu rob roe ron roo ror rot rou rrb rrn rrr rrt rru rtb rte rtn rto rtr rtt rtu rub rue run ruo rur rut ruu tbb tbe tbn tbo tbr tbt tbu te- teb tee ten teo ter tet teu tnb tne tnn tno tnr tnt to- tob toe ton too tor tot tou trb tre trn tro trr trt tru ttb tte ttn tto ttr ttt ttu tub tue tun tuo tur tut tuu ubb ube ubn ubo ubr ubt ubu ueb uee uen uer uet un- unb une unn uno unr unt unu uob uoe uon uoo uor uot ur- urb ure urn uro urr urt uru utb ute utn uto utr utt utu uue uun uur uut uuu