fff ffn ffo ffp ffr fnf fnn fnp fnr fof fon foo fop for fpn fpo fpp fpr frf frn fro frp frr nff nfn nfo nfp nfr nnf nnn nno nnp no- nof non noo nop nor npf npn npo npp npr nrf nrn nro nrp nrr of- off ofn ofo ofp ofr on- onf onn ono onp onr oo- oof oon ooo oop oor op- opf opn opo opp opr or- orf orn oro orp orr p-p pff pfn pfo pfp pfr pn- pnf pnn pno pnp pnr pof pon poo pop por ppf ppn ppo ppp ppr prf prn pro prp prr rff rfn rfo rfp rfr rnn rno rnp rnr rof ron roo rop ror rpf rpn rpo rpp rpr rrf rrn rrp rrr

ffff ffrr fofo fono foof foon fopp for- forn foro forr fprf fron frop nfff nfon nnnn nnpr non- nonn nono noo- noon nooo noop noor nor- norf norn noro norr nron nrpn off- offo offr ofno ofor onno onon onor ooff oooo opo- opon opor oppo orff orno oro- orof oron oror orro pfff pffr pnon pnpo pnpp pnro poff pono ponp poof poon poop poor pop- popo popp porn poro porr pppn pppo pppp pprf prnp pro- prof pron proo prop roff rofo rono roof roon roop roor ropo roro rpof rpon rppn rrrr

forno forro froop frorn n-p-n nnooo no-no no-op nofor nonno nonop noron norro nroff offof offon ofono oforn ofpop onoff onoon onorn onpop ooooo oppon orfor ornon orono p-n-p pforp po-on po-po ponor poopo popon popop poppo porn- porno poro- poron porro proff proof proor prop- propn propp propr ro-ro rofor ronno rprop

foofoo noforn non-no non-op nonono nonoon nonpro noonoo noonor noroff noroof ofpoor on-off oooooo poopoo popfor popoff popopo poporo poppop porno- porron pppppp profor ronnon ronron

foo-foo nonpoor nonroof off-off ofproof onoffon poo-poo poonoor pop-off

forfrorn nononono poorpoor poroporo

proof-proof