fff ffi ffn ffo ffp ffr fif fii fin fip fir fnf fni fnn fnp fnr fof foi fon foo fop for fpi fpn fpo fpp fpr frf fri frn fro frp frr i-f iff ifi ifn ifo ifp ifr iif iii iin iio iip iir in- inf ini inn ino inp inr io- iof ioi ion ioo iop ior ipf ipi ipn ipo ipp ipr ir- irf iri irn iro irp irr n-i nff nfi nfn nfo nfp nfr nif nii nin nio nip nir nnf nni nnn nno nnp no- nof noi non noo nop nor npf npi npn npo npp npr nrf nri nrn nro nrp nrr o-i of- off ofi ofn ofo ofp ofr oif oii oin oio oip oir on- onf oni onn ono onp onr oo- oof ooi oon ooo oop oor op- opf opi opn opo opp opr or- orf ori orn oro orp orr p-p pff pfi pfn pfo pfp pfr pif pii pin pio pip pir pn- pnf pni pnn pno pnp pnr pof poi pon poo pop por ppf ppi ppn ppo ppp ppr prf pri prn pro prp prr rff rfi rfn rfo rfp rfr rif rii rin rio rip rir rni rnn rno rnp rnr rof roi ron roo rop ror rpf rpi rpn rpo rpp rpr rrf rri rrn rrp rrr