frond rfond fornd ofrnd rofnd orfnd frnod rfnod fnrod nfrod rnfod nrfod fonrd ofnrd fnord nford onfrd nofrd ronfd ornfd rnofd nrofd onrfd norfd frodn rfodn fordn ofrdn rofdn orfdn frdon rfdon fdron dfron rdfon drfon fodrn ofdrn fdorn dforn odfrn dofrn rodfn ordfn rdofn drofn odrfn dorfn frndo rfndo fnrdo nfrdo rnfdo nrfdo frdno rfdno fdrno dfrno rdfno drfno fndro nfdro fdnro dfnro ndfro dnfro rndfo nrdfo rdnfo drnfo ndrfo dnrfo fondr ofndr fnodr nfodr onfdr nofdr fodnr ofdnr fdonr dfonr odfnr dofnr fndor nfdor fdnor dfnor ndfor dnfor ondfr nodfr odnfr donfr ndofr dnofr rondf orndf rnodf nrodf onrdf nordf rodnf ordnf rdonf dronf odrnf dornf rndof nrdof rdnof drnof ndrof dnrof ondrf nodrf odnrf donrf ndorf dnorf
Note: these 'words' (valid or invalid) are all the permutations of the word frond. These words are obtained by scrambling the letters in frond.