text: #ifndef TUPLE_H
  #define TUPLE_H
  
  #include <iostream>
  
  using namespace std;
  
  class Tuple
  {
      int op1;
      int op2;
      int size;
      int *values;
      public:
          Tuple();
          Tuple(int s);
          Tuple(int s, int *v);
          virtual ~Tuple();
          Tuple &operator=(Tuple &);
          bool operator==(Tuple&);
  
      friend ostream &operator<<(ostream &,Tuple &);
      friend class NegConstraint;
      friend class PLProblem;
  };
  
  #endif // TUPLE_H
  