-er bbb bbe bbf bbn bbo bbr be- beb bee bef ben beo ber bfb bfe bff bfn bfo bfr bnb bne bnf bnn bno bnr bob boe bof bon boo bor brb bre brf brn bro brr ebb ebe ebf ebn ebo ebr eeb eee eef een eeo eer ef- efb efe eff efo efr en- enb ene enf enn eno enr eo- eob eoe eof eon eoo eor erb ere erf ern ero err fbb fbe fbf fbn fbo fbr feb fee fef fen feo fer ffe fff ffn ffo ffr fnb fne fnf fnn fnr fob foe fof fon foo for frb fre frf frn fro frr nbb nbe nbf nbn nbo nbr ne- neb nee nef nen neo ner nfb nfe nff nfn nfo nfr nnb nne nnf nnn nno no- nob noe nof non noo nor nrb nre nrf nrn nro nrr ob- obb obe obf obn obo obr oeb oee oef oen oeo oer of- ofb ofe off ofn ofo ofr on- onb one onf onn ono onr oo- oob oof oon ooo oor or- orb ore orf orn oro orr rbb rbe rbf rbn rbo rbr re- reb ree ref ren reo rer rfb rfe rff rfn rfo rfr rnb rnn rno rnr rob roe rof ron roo ror rrb rrf rrn rrr