def main():
	words_list = ["hello", "hi", "hello", "goodbye", "goodbye", "hey", "hi"]
	unique_list = eliminate_duplicates(words_list)
	print(unique_list)

def eliminate_duplicates(words_list):
	unique_list = []
	for word in words_list:
		if word not in unique_list:
			unique_list = unique_list + [word]
	return unique_list
main()