20. The system of claim 1 , wherein said statement is at least one grammatical sentence and wherein said role defines a noun and said relation defines a verb in said grammatical sentence.
20. The system of claim 1 , wherein said statement is at least one grammatical sentence and wherein said role defines a noun and said relation defines a verb in said grammatical sentence. 28. The system of claim 20 , wherein said grammatical sentence comprises arithmetical operators and comparisons.