def mode(self, event, flag, users):
        flag = self.build_flag(flag, users.__len__())
        users= ' '.join(users)

        self.execute("MODE", event.target, flag, users)

    def op(self, event, users):
        self.mode(event, '+o', users)

    def voice(self, event, users):
        self.mode(event, '+v', users)