Member Avatar for nurulshidanoni

How to make a pair programming..

like I have 1 2 3 4 5 6 7
First, I want to make a pair of 91,20
(1,3)
(1,4)
(1,5)

using i=1, i<9,i++

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There are three separate issues that caused the long error list: simple syntax mistakes, a name collision (you declared a variable called pair), and confusion between a custom Pair class (which can have a Display() method) and std::pair (which only exposes .first and .second). Fix the tiny syntax problems first — usingnamespace std; must be using namespace std;, const int students.size = 12; is invalid, and for (int i = 0; i < n; i++); (note the trailing semicolon) makes the loop body run only once. Those small errors produce lots of follow-on compiler messages.

A clean, modern approach is: keep the numbers in a vector and generate/store pairs in a std::vector<std::pair<int,int>> (avoid raw new/raw arrays unless you need them). This both fixes lifetime management and is simpler to read. Example (C++11+):

#include <iostream>
#include <vector>
#include <utility>

int main() {
    std::vector<int> a = {1,2,3,4,5,6,7};
    std::vector<std::pair<int,int>> pairs;
    for (size_t i = 0; i < a.size(); ++i)
        for (size_t j = i + 1; j < a.size(); ++j)
            pairs.emplace_back(a[i], a[j]); // unique unordered pairs

    for (const auto &p : pairs)
        std::cout << '(' << p.first << ',' << p.second << ")\n";
}

If you want to keep the custom Pair template from Post #2, make sure the full template definition is visible before main, don’t name a variable pair (that hides the type), and declare the copy ctor as a const reference (Pair(const Pair<C>&)). If you allocate objects with new, either delete them or prefer std::vector / smart pointers to avoid leaks. Thanks to for the pointer/array idea and to for pointing out that std::pair requires two template parameters — those hints are what fixed the problem for . Quick checklist: correct using syntax, remove stray semicolons after for, avoid shadowing standard types with variable names, and prefer std::vector<std::pair<...>> for simple pair storage.

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Member Avatar for nurulshidanoni

I want to do like this, but how to call from i=0, i<11; i++, and how o insert in this program.

#include <iostream.h>

template<class C> 
class Pair
{
public:
	Pair(C, C);
	Pair(Pair&);
	void Display();

private:
	C first;
	C second;
};

template<class C> 
Pair<C>::Pair(C left, C right)
{
	first = left;
	second = right;
}


template<class C> 
Pair<C>::Pair(Pair<C>& p)
{
	first = p.first;
	second = p.second;
}

template<class C> 
void Pair<C>::Display()
{
	cout<<"(" << first <<","<< second <<")"<<"\n";
}

int main()
{
	Pair<int> pi(2,3);

	pi.Display();

	return 0;
}
Member Avatar for Joatmon

Well since you want to do it in a for loop, you must realize that this is probably a job for pointers since you can't make a for loop generate names for your variables to hold the class. What I would do is this:

int main()
{
    const int SIZE = 8;
    Pair<int> * pairs[SIZE]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < SIZE; i++)
        pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	return 0;
}
Member Avatar for nurulshidanoni

I dont understand

Member Avatar for Joatmon

If you do not understand what pointers are or how they work, it would not be fitting to describe every aspect of them in this thread.

I will however give you a good tutorial on pointers, and when you practice with their examples, you should have a decent grasp of them, then you may come back to the example I gave previously and it should seem more clear.

Member Avatar for nurulshidanoni

I understand now, but a lot of error.


error C2065: 'pairs' : undeclared identifier
error C2109: subscript requires array or pointer type
error C2061: syntax error : identifier 'Pair'
error C2109: subscript requires array or pointer type
error C2227: left of '->Display' must point to class/struct/union
error C2143: syntax error : missing ';' before '}'
error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : fatal error C1003: error count exceeds 100; stopping compilation
Error executing cl.exe.

78.exe - 102 error(s), 0 warning(s)

Member Avatar for Joatmon

Can you post your source now please? (and edit out the big error list, it is mostly the same error over and over again and is just a big waste of space)

I will see what you have and try to help you out.

Member Avatar for nurulshidanoni

Here it is..

#include <iostream>
usingnamespace std;
{
    const int students.size = 12;
    Pair<int> * pairs[students.size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < students.size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	
	return 0;
	}
Member Avatar for Joatmon

1.
Did you make sure you kept what you had in front of main? I remove that from the code i posted as it is the same as you had, only the things in main were what i changed.

2.
students.size is referring to a data member of an object that doesn't exist. Moreover, since it would be a data member inside an object, it couldn't be declared again. Use a plain variable name instead of students.size. maybe students_size

Member Avatar for nurulshidanoni

This is a full code. but error.fatal error C1003: error count exceeds 100; stopping compilation
Error executing cl.exe.

is it cannot exceed 100?

/*------------------------------------------------------------------------------------------+
|                           Filename : ConflictMatrix.cpp                                   |
+------------------------------------------------------------------------------------------*/

#include <iostream>  // std::cout
#include <fstream>
#include <iomanip>
#include <string>    // std::string
#include <vector>    // std::vector<>
#include <algorithm> //std::for each()
using namespace std; // import "std" namespace into global namespace


   struct student
{
   string studentid;
   vector <int> examcode;   
};
		int main()
	{
		ifstream stream1 ("STA83STU.txt");
		if ( !stream1 )
		{
			cout << "While opening a file an error is encountered" << endl;
		}
			else
			{
			cout << "File is successfully opened" << endl;
			}  
			
				vector <student> students;
				student aStudent;
				string tempStudentID;
				bool readEntireFile = false;     // set to true when reach end of file

			    stream1 >> tempStudentID;    //  read in student id of first student
				while ( !readEntireFile )
		
				{

					aStudent.studentid = tempStudentID;  //  new student
					int tempExamCode;
					aStudent.examcode.clear ();
					stream1 >> tempExamCode;    // read in first exam code for this student
					aStudent.examcode.push_back (tempExamCode);  // add this exam code to current student's vector of exam codes
					bool newStudent = false;   // true when a new student id is encountered
					while ( !newStudent && !readEntireFile )
			
					{
		
					if ( stream1 >> tempStudentID )   // successfully read in student id
			
						{
						if ( tempStudentID.compare (aStudent.studentid) == 0 )  // student id is same as before
					
							{
							stream1 >> tempExamCode;   // read in exam code
							aStudent.examcode.push_back (tempExamCode); // add this exam code to this student;s vector of exam codes
							}
				
						else
						newStudent = true;   // student id is different from before.  Therefore new student.
						}
				
					else
					readEntireFile = true;  // end of file reached.  Want to exit inner and outer while loops
					}  // if new student, do not repeat this while loop
		
					students.push_back (aStudent);   // no more exam codes for this student.  Add aStudent to students vector
				}
	
				stream1.close ();  // We have read the entire file, so time to close it.

				for ( int i = 0 ; i < students.size (); i++ )
					{
					cout <<i<<":\t" ;   // output student id
					for ( int j = 0;j<students.at(i).examcode.size(); j++ )
					cout << students.at (i).examcode.at(j) <<"\t";   // output list of exam codes for this student
					cout<<""<<"\n";       
					} 
/*--------------------------------------------------------------------------------------------+
|                         counting elements in StudentID                                     |
+--------------------------------------------------------------------------------------------*/
  
	{
    const int student_size = 12;
    Pair<int> * pairs[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	
	return 0;
	}
/*-------------------------------------------------------------------------------------------+		
|                                         Matrix ExamID                                       
+--------------------------------------------------------------------------------------------*/
   {
cout<<"i,j|";
for (int colHead = 1; colHead < 11; colHead++)
cout << setw(3) << colHead;
cout << endl;
cout <<"__________________________________"<<endl;

			for (int rowVal = 1; rowVal < 11; rowVal++)
		{
			cout << setw(3)<< rowVal <<'|';

			for (int colVal =1; colVal < 11; colVal++)
			cout << setw(3)<<"x";
			cout <<endl;
		}
	} 
}
Member Avatar for nurulshidanoni

What is the class of Display?


error C2061: syntax error : identifier 'pair'
error C2109: subscript requires array or pointer type
error C2227: left of '->Display' must point to class/struct/union

{
	int pair;
    const int student_size = 12;
    pair <int> * pair[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++);
    
	{
	pair[i] = new pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pair[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	}
	return 0;
	}
Member Avatar for Ancient Dragon

What is the class of Display?


error C2061: syntax error : identifier 'pair'
error C2109: subscript requires array or pointer type
error C2227: left of '->Display' must point to class/struct/union

{
	int pair;
    const int student_size = 12;
    pair <int> * pair[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++);
    
	{
	pair[i] = new pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pair[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	}
	return 0;
	}

delete line 3 because it hids the c++ class by the same name.

Member Avatar for nurulshidanoni

error C2976: 'pair' : too few template arguments
see declaration of 'pair'

Why there is too few template arguments when i delete line 3?

Member Avatar for nurulshidanoni

So, I put put like this?

{
typedef std::pair<int,int>       RandomPair;
typedef std::vector<RandomPair>  VectorRandomPair;

    const int student_size = 12;
    pair <int> * pair[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++)
    	
	pair[i] = new pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pair[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	
	return 0;
	}
Member Avatar for Ancient Dragon

Here is a pretty good explaination of pair. As its name implies, and that link explicitly states, pair required two objects, not one as you have on line 7 And you can not have the name of the array the same as the class name -- the array name must be something else.

const int student_size = 12;
pair<int,int>* array[student_size];
 for (int i = 0; i < student_size; i++)   	
      array[i] = new pair<int,int>(1,i); // Construct each new pair and give its address to an index in the pointer array

I didn't compile or test the above, so use it at your own risk.

Member Avatar for nurulshidanoni

Thank you ancient dragon. It succefully work out!!!!

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