-er -ol bbb bbe bbl bbn bbo bbr bbx be- beb bee bel ben beo ber bex blb ble bll bln blo blr blx bnb bne bnl bnn bno bnr bnx bob boe bol bon boo bor box brb bre brl brn bro brr brx bxb bxl bxn bxo bxx ebb ebe ebl ebn ebo ebr ebx eeb eee eel een eeo eer eex elb ele ell eln elo elr elx en- enb ene enl enn eno enr eo- eob eoe eol eon eoo eor erb ere erl ern ero err ex- exe exl exo exr exx lbb lbe lbl lbo lbr lbx leb lee lel len leo ler lex llb lle lll lln llo llr lnb lne lnl lnn lno lnr lob loe lol lon loo lor lox lrb lrn lro lrr lxo lxr lxx nbb nbe nbl nbn nbo nbr nbx ne- neb nee nel nen neo ner nex nlb nle nll nln nlo nlr nlx nnb nne nnl nnn nno no- nob noe nol non noo nor nox nrb nre nrl nrn nro nrr nrx nxl ob- obb obe obl obn obo obr obx oeb oee oel oen oeo oer oex olb ole oll oln olo on- onb one onl onn ono onr onx oo- oob ool oon ooo oor oox or- orb ore orl orn oro orr orx ox- oxb oxn oxo oxx rbb rbe rbl rbn rbo rbr rbx re- reb ree rel ren reo rer rex rle rll rln rlo rlr rnb rnn rno rnr rob roe rol ron roo ror rox rrb rrl rrn rrr rxr xbe xbl xbr xbx xee xel xen xer xex xlb xlr xno xon xoo xor xox xrx xxl xxo xxx