class User:    def __init__(self, name, emails):        self.name = name        self.emails = set(emails)class Solution:    def accountsMerge(self, accounts: List[List[str]]) -> List[List[str]]:        email_mapping = {}        for account in accounts:            user_account = User(account[0], account[1:])            other_accounts = set()            for email in user_account.emails:                if email in email_mapping:                    other_accounts.add(email_mapping[email])            for other_account in other_accounts:                user_account.emails |= other_account.emails            for email in user_account.emails:                email_mapping[email] = user_account        users = set(user for user in email_mapping.values())        return [[user.name] + sorted(user.emails) for user in users]