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 | struct ltstr
{
  bool operator()(const char* s1, const char* s2) const
  { return strcmp(s1, s2) < 0; }
};
 
int main( int argc, char *argv[] )
{
  const char* a[] = { "Gray", "Pete", "Oggy", "Philip", "JAF", "Simon", "Nick",
                      "Elliott", "Roy", "David", "Tony", "Nigel" };
  const char* b[] = { "Sandy", "John", "Andrzej", "Rob", "Phil", "Happy",
                      "Elliott", "Roy", "David", "Tony", "Nigel" };
 
  set<const char*, ltstr> A(a, a + sizeof(a)/sizeof(a[0]) );
  set<const char*, ltstr> B(b, b + sizeof(b)/sizeof(b[0]) );
  set<const char*, ltstr> C;
 
  cout << "Set A: ";
  copy(A.begin(), A.end(), ostream_iterator<const char*, char>(cout, " ") ); | 
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