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namespace std {
template <typename T> struct less {
bool operator()(const T &lhs, const T &rhs) { return lhs < rhs; }
};
template <typename T> struct greater {
bool operator()(const T &lhs, const T &rhs) { return lhs > rhs; }
};
struct iterator_type {};
template <typename K, typename Cmp = less<K>> struct set {
typedef iterator_type iterator;
iterator find(const K &k);
unsigned count(const K &k);
iterator begin();
iterator end();
iterator begin() const;
iterator end() const;
};
template <typename FwIt, typename K>
FwIt find(FwIt, FwIt end, const K &) { return end; }
}
template <typename T> void f(const T &t) {
std::set<int> s;
find(s.begin(), s.end(), 46);
}