48. The apparatus of claim 43, wherein said expressions are represented in the document as words, and said frequency determining means automatically determines whether said expressions have said first predetermined level of complexity by determining a length of said words.
48. The apparatus of claim 43, wherein said expressions are represented in the document as words, and said frequency determining means automatically determines whether said expressions have said first predetermined level of complexity by determining a length of said words. 49. The apparatus of claim 48, wherein said frequency determining means automatically determines the length of said words by determining a number of characters in said words.