-ol fff ffl ffn ffo ffr flf fll fln flo flr fnf fnl fnn fnr fof fol fon foo for frf frl frn fro frr lff lfl lfn lfo lfr llf lll lln llo llr lnl lnn lno lnr lof lol lon loo lor lrf lrn lro lrr nff nfl nfn nfo nfr nlf nll nln nlo nlr nnf nnl nnn nno no- nof nol non noo nor nrf nrl nrn nro nrr of- off ofl ofn ofo ofr olf oll oln olo on- onf onl onn ono onr oo- oof ool oon ooo oor or- orf orl orn oro orr rff rfl rfn rfo rfr rlf rll rln rlo rlr rnn rno rnr rof rol ron roo ror rrf rrl rrn rrr