18. The article of manufacture of claim 16 , wherein the means is for deriving the error messages from the input error message by locating the error patterns representative of the input error message and deriving the error sub-patterns from the error patterns, each error sub-pattern being one of the error messages.
18. The article of manufacture of claim 16 , wherein the means is for deriving the error messages from the input error message by locating the error patterns representative of the input error message and deriving the error sub-patterns from the error patterns, each error sub-pattern being one of the error messages. 19. The article of manufacture of claim 18 , wherein the means is for deriving the error sub-patterns from the error patterns by constructing different combinations of sub-parts of the error patterns.