#codingexercise
Given two strings, how do you delete characters contained in the second string from the first string? For example, if all characters in the string “aeiou” are deleted from the string “We are students.”, the result is “W r stdnts.”.
Solution: 
Void DeleteCharacters(String input, String characters)
{
Var h = new HashTable();
For (int I =0; I < characters.length; i++)
                H[characters[i]]  = 1;
String ret = string.empty;
For (int r = 0; r < input.length; r++)
     If (h[input[r]] != 1)
                Ret += input[r];
Return ret; 

}

Next we continue our discussion of Text Summarization by Hovy. We now look at the other two stages of Interpretation and generation.
Topic fusion or interpretation as mentioned earlier is what sets apart summarization systems from abstract type systems. During summarization, the topics identified as important are fused, represented in new terms even using concepts or words not found in the original text. No system can perform interpretation without prior knowledge  about the domain. At first glance, template representation is used in information extraction is promising but the difficulty of building and filling such structures is makes large scale summarization impractical at present.
Hahn and Reimer 1999 develop operators that condense knowledge structures in a terminological logic through conceptual abstraction. Till date no parser has been built to produce the knowledge structures.
Interpretation remains blocked by problems of domain knowledge acquisition.
The third major stage in summarization is generation. When the summary content has been created through abstracting and/or information extraction, it exists within the computer as internal notations and thus requires the techniques of natural language generation.

#codingexercise
How to generate Sudoku puzzles for a puzzle book:  http://1drv.ms/1K2Yeao