#include <cstddef> // for size_t
#include <vector>
+#include <set>
#include <map>
// CINT needs <algorithm> to work properly with <vector>
#include <algorithm>
class print_context;
typedef std::vector<ex> exvector;
+typedef std::set<ex, ex_is_less> exset;
typedef std::map<ex, ex, ex_is_less> exmap;
// Define this to enable some statistical output for comparisons and hashing