ultra lutra utlra tulra ltura tlura ulrta lurta urlta rulta lruta rluta utrla turla urtla rutla trula rtula ltrua tlrua lrtua rltua trlua rtlua ultar lutar utlar tular ltuar tluar ulatr luatr ualtr aultr lautr alutr utalr tualr uatlr autlr taulr atulr ltaur tlaur latur altur talur atlur ulrat lurat urlat rulat lruat rluat ulart luart ualrt aulrt laurt alurt uralt rualt uarlt aurlt rault arult lraut rlaut larut alrut ralut arlut utral tural urtal rutal trual rtual utarl tuarl uatrl autrl taurl aturl uratl ruatl uartl aurtl rautl arutl traul rtaul tarul atrul ratul artul ltrau tlrau lrtau rltau trlau rtlau ltaru tlaru latru altru talru atlru lratu rlatu lartu alrtu raltu arltu tralu rtalu tarlu atrlu ratlu artlu
Note: these 'words' (valid or invalid) are all the permutations of the word ultra. These words are obtained by scrambling the letters in ultra.