-er bbb bbe bbn bbo bbr bbt be- beb bee ben beo ber bet bnb bne bnn bno bnr bnt bob boe bon boo bor bot brb bre brn bro brr brt btb bte btn bto btr btt ebb ebe ebn ebo ebr ebt eeb eee een eeo eer eet en- enb ene enn eno enr ent eo- eob eoe eon eoo eor eot erb ere ern ero err ert etb ete etn eto etr ett nbb nbe nbn nbo nbr nbt ne- neb nee nen neo ner net nnb nne nnn nno nnt no- nob noe non noo nor not nrb nre nrn nro nrr nrt ntb nte ntn nto ntr ntt ob- obb obe obn obo obr obt oeb oee oen oeo oer oet on- onb one onn ono onr ont oo- oob oon ooo oor oot or- orb ore orn oro orr ort ot- otb ote otn oto otr ott rbb rbe rbn rbo rbr rbt re- reb ree ren reo rer ret rnb rnn rno rnr rnt rob roe ron roo ror rot rrb rrn rrr rrt rtb rte rtn rto rtr rtt tbb tbe tbn tbo tbr tbt te- teb tee ten teo ter tet tnb tne tnn tno tnr tnt to- tob toe ton too tor tot trb tre trn tro trr trt ttb tte ttn tto ttr ttt