artel ratel atrel tarel rtael trael aretl raetl aertl eartl reatl eratl aterl taerl aetrl eatrl tearl etarl rteal treal retal ertal teral etral artle ratle atrle tarle rtale trale arlte ralte alrte larte rlate lrate atlre talre altre latre tlare ltare rtlae trlae rltae lrtae tlrae ltrae arelt raelt aerlt earlt realt eralt arlet ralet alret laret rlaet lraet aelrt ealrt alert laert elart leart relat erlat rleat lreat elrat lerat atelr taelr aetlr eatlr tealr etalr atler taler alter later tlaer ltaer aeltr ealtr aletr laetr elatr leatr telar etlar tlear ltear eltar letar rtela trela retla ertla terla etrla rtlea trlea rltea lrtea tlrea ltrea relta erlta rleta lreta elrta lerta telra etlra tlera ltera eltra letra
Note: these 'words' (valid or invalid) are all the permutations of the word artel. These words are obtained by scrambling the letters in artel.