20. The method of claim 17 , comprising generating an accumulated OR (Acc. OR) for each word by adding the ORs of preceding words, as ranked from highest to lowest ORs, wherein said removing words is effected in accordance with the following: 
 If the Acc.OR (of a word in, e.g., EN)>L % and the Acc.OR in any of the other language docs (e.g., ES, FR, DE, IT)<M %, then remove the word from the doc (EN). where L % is within a range of at least about 0%; up to about 90%; and M % is within a range of about 5%; to about 100%.
17. The method of claim 13 , comprising: comparing the occurrence ratios of the clean text with the occurrence ratios of the foreign text; and removing words from the clean text which have an OR less than the OR of the foreign text, to generate foreign-word-free clean text.