#include <iostream>
#include <set>
#include <cstdlib>
 
inline int irand(int min, int max) {
    return ((double)rand() / ((double)RAND_MAX + 1.0)) * (max - min + 1) + min;
}
 
std::string generateHashTag() {
	char str[5];
	for (int i = 0; i < 4; ++i)
		str[i] = irand('a', 'z');
	str[4] = '\0';
	return std::string(str);
}
 
int main() {
 
	const size_t N = 5;
	std::set<std::string> myHashTags;
 
	srand(time(0));
	while (myHashTags.size() < N)
		myHashTags.insert(generateHashTag());
 
	for (std::set<std::string>::iterator i = myHashTags.begin();
	     i != myHashTags.end(); ++i)
	     std::cout << *i << ' ';
 
	return 0;
}

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