-er -ol bbb bbe bbl bbn bbo bbr be- beb bee bel ben beo ber blb ble bll bln blo blr bnb bne bnl bnn bno bnr bob boe bol bon boo bor brb bre brl brn bro brr ebb ebe ebl ebn ebo ebr eeb eee eel een eeo eer elb ele ell eln elo elr en- enb ene enl enn eno enr eo- eob eoe eol eon eoo eor erb ere erl ern ero err lbb lbe lbl lbo lbr leb lee lel len leo ler llb lle lll lln llo llr lnb lne lnl lnn lno lnr lob loe lol lon loo lor lrb lrn lro lrr nbb nbe nbl nbn nbo nbr ne- neb nee nel nen neo ner nlb nle nll nln nlo nlr nnb nne nnl nnn nno no- nob noe nol non noo nor nrb nre nrl nrn nro nrr ob- obb obe obl obn obo obr oeb oee oel oen oeo oer olb ole oll oln olo on- onb one onl onn ono onr oo- oob ool oon ooo oor or- orb ore orl orn oro orr rbb rbe rbl rbn rbo rbr re- reb ree rel ren reo rer rle rll rln rlo rlr rnb rnn rno rnr rob roe rol ron roo ror rrb rrl rrn rrr