Someone who votes twice

In this poll, each person can vote only once. Predict the output without running the code.

Code

class Poll:
    def __init__(self, question):
        self.question = question
        self.yes = 0
        self.no = 0
        self.voters = []

    def vote(self, name, answer):
        if name in self.voters:
            print("Already voted:", name)
            return
        self.voters.append(name)
        if answer == "yes":
            self.yes += 1
        else:
            self.no += 1

poll = Poll("Bibimbap for lunch?")
poll.vote("mina", "yes")
poll.vote("jun", "no")
poll.vote("mina", "no")
poll.vote("sora", "yes")
print(poll.yes, poll.no, len(poll.voters))