-er eee eef eeo eep eer ef- efe eff efo efp efr eo- eoe eof eoo eop eor ep- epe epf epo epp epr ere erf ero erp err fee fef feo fep fer ffe fff ffo ffp ffr foe fof foo fop for fpe fpo fpp fpr fre frf fro frp frr oee oef oeo oep oer of- ofe off ofo ofp ofr oo- oof ooo oop oor op- ope opf opo opp opr or- ore orf oro orp orr p-p pee pef peo pep per pfe pff pfo pfp pfr poe pof poo pop por ppe ppf ppo ppp ppr pre prf pro prp prr re- ree ref reo rep rer rfe rff rfo rfp rfr roe rof roo rop ror rpe rpf rpo rpp rpr rrf rrp rrr

eeee eefe eero efeo efor eore epee eper epor eppo eppp epro eprp erer eroe eroo erpe erre erro feer fefe feff fefo feof fere fero ferr ffee ffff ffrr foer fofo foof fopp for- fore foro forr fprf free freo frep froe frop o-eo oere ofer off- offe offo offr ofor ofre ooer ooff oooo oore opep oper opo- opor oppo ore- oreo orer orfe orff oro- oroe orof oror orpe orro peep peer peff peor pepe pepo per- pere perf pero perp perr pfff pffr poer poff poof poop poor pop- pope popo popp pore poro porr pper pppo pppp pprf pre- pree pref prep pro- proe prof proo prop reef reep refe reff refr reof reop repe repo repp repr rere rero rfef roer rofe roff rofo roof roop roor rope ropo rore roro rpoe rpof rrrr

e-pro eeeee eepee efere effer efore eofor eorre erere eroor erore error feeor feere fefor feoff ferr- ferre ferro foore fore- foreo forro freep freer frere froop frore o-fer oeppo offer offof offre ofpop oo-er ooooo opepe opere opper oreo- orere orero orfeo orfoe orfor oroer p-rep peere pepee peppe perer perre perro pforp po-po pooer poope poopo poore poper popop poppe poppo porer poro- porro preef preff preop proer profe proff proof proor prop- prope propp propr prore reefe reepe reere refer reffe reffo repop repor reppe repro rere- reree ro-ro roero roffe rofor rooer roofe roope roore roper roppe rorer rperf rprop

effere effoff effore epopee feeror feofor ferfer ferrer ferro- foerre foofoo fopper forrer freeof freepr frefre froofe oferre ofpoor oooooo peepee peeper peerer peffer pepero pepper perere peroff peroor perore perper perree pooper poopoo poorer popfor popoff popopo poporo popper poppop pppppp pre-op prefer preffe preore profer proffe profor profre proper propre reefer reeffe reeper refeff repope repper repref reroof roeper roofer roopee rooper

eeeroer errorof feoffee feoffer feoffor ferrere ferrero foo-foo forfere forfree freefor freeppp off-off offeree offerer offeror ofproof orepeer pee-pee perrero perrore pfeffer poo-poo pop-off porpere porpore preferr preffer prepere prepper proffer proffre proofer proofre propero propper refeoff referee referer reoffer repreef reprefe reproof rerefer ropeoff

feeoffee forereef peeppeep pepperer peroffer perrerer poorpoor poroporo preferee preferer preoffer properer referree referrer reproffe

errorfree poee-poee preferree preferrer profferer repe-refe reproffer

errorproof proreferee

proof-proof