-er b-u bbb bbe bbn bbo bbr bbt bbu bbx be- beb bee ben beo ber bet beu bex bnb bne bnn bno bnr bnt bnu bnx bob boe bon boo bor bot bou box brb bre brn bro brr brt bru brx btb bte btn bto btr btt btu btx bub bue bun buo bur but buu bux bxb bxn bxo bxx ebb ebe ebn ebo ebr ebt ebu ebx eeb eee een eeo eer eet eex 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 etx eu- eub eue eun eur eut eux ex- exe exo exr ext exu exx nbb nbe nbn nbo nbr nbt nbu nbx ne- neb nee nen neo ner net neu nex nnb nne nnn nno nnt nnu no- nob noe non noo nor not nou nox nrb nre nrn nro nrr nrt nru nrx ntb nte ntn nto ntr ntt ntu ntx nub nue nun nuo nur nut nuu nux nxt ob- obb obe obn obo obr obt obu obx oeb oee oen oeo oer oet oex on- onb one onn ono onr ont onu onx oo- oob oon ooo oor oot oox or- orb ore orn oro orr ort oru orx ot- otb ote otn oto otr ott otu ou- oue oun ouo our out ox- oxb oxn oxo oxt oxx rbb rbe rbn rbo rbr rbt rbu rbx re- reb ree ren reo rer ret reu rex rnb rnn rno rnr rnt rnu rob roe ron roo ror rot rou rox rrb rrn rrr rrt rru rtb rte rtn rto rtr rtt rtu rtx rub rue run ruo rur rut ruu rux rxr t-x tbb tbe tbn tbo tbr tbt tbu te- teb tee ten teo ter tet teu tex tnb tne tnn tno tnr tnt tnx to- tob toe ton too tor tot tou tox trb tre trn tro trr trt tru trx ttb tte ttn tto ttr ttt ttu ttx tub tue tun tuo tur tut tuu tux txe txn txt txu ubb ube ubn ubo ubr ubt ubu ubx ueb uee uen uer uet un- unb une unn uno unr unt unu unx uob uoe uon uoo uor uot uox ur- urb ure urn uro urr urt uru urx utb ute utn uto utr utt utu utx uue uun uur uut uuu uxb uxo uxr uxt uxu xbe xbr xbx xee xen xer xet xeu xex xno xnu xon xoo xor xot xox xrt xrx xtr xtx xue xun xxo xxx