secua escua sceua cseua ecsua cesua seuca esuca sueca useca eusca uesca scuea csuea sucea uscea cusea ucsea ecusa ceusa eucsa uecsa cuesa ucesa secau escau sceau cseau ecsau cesau seacu esacu saecu asecu eascu aescu scaeu csaeu saceu asceu caseu acseu ecasu ceasu eacsu aecsu caesu acesu seuac esuac sueac useac eusac uesac seauc esauc saeuc aseuc easuc aesuc suaec usaec sauec asuec uasec ausec euasc ueasc eausc aeusc uaesc auesc scuae csuae sucae uscae cusae ucsae scaue csaue sacue ascue casue acsue suace usace sauce asuce uasce ausce cuase ucase cause acuse uacse aucse ecuas ceuas eucas uecas cueas uceas ecaus ceaus eacus aecus caeus aceus euacs ueacs eaucs aeucs uaecs auecs cuaes ucaes caues acues uaces auces
Note: these 'words' (valid or invalid) are all the permutations of the word secua. These words are obtained by scrambling the letters in secua.