2. The method of claim 1 , wherein said repeating (d) is effected for a plurality of texts written in said predetermined language.
2. The method of claim 1 , wherein said repeating (d) is effected for a plurality of texts written in said predetermined language. 3. The method of claim 2 , wherein said filtering (e) comprises filtering words from one of said texts which have an occurrence ratio that is higher than a corresponding occurrence ratio in at least one other of said texts, to generate a clean text.