lurec ulrec lruec rluec urlec rulec luerc ulerc leurc elurc uelrc eulrc lreuc rleuc leruc elruc reluc erluc urelc ruelc uerlc eurlc reulc erulc lurce ulrce lruce rluce urlce rulce lucre ulcre lcure clure uclre culre lrcue rlcue lcrue clrue rclue crlue urcle rucle ucrle curle rcule crule luecr ulecr leucr elucr uelcr eulcr lucer ulcer lcuer cluer ucler culer lecur elcur lceur cleur eclur celur ueclr euclr ucelr cuelr eculr ceulr lrecu rlecu lercu elrcu relcu erlcu lrceu rlceu lcreu clreu rcleu crleu lecru elcru lceru cleru eclru celru reclu erclu rcelu crelu ecrlu cerlu urecl ruecl uercl eurcl reucl erucl urcel rucel ucrel curel rcuel cruel uecrl eucrl ucerl cuerl ecurl ceurl recul ercul rceul creul ecrul cerul
Note: these 'words' (valid or invalid) are all the permutations of the word lurec. These words are obtained by scrambling the letters in lurec.