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State Users: \mathbb{P} User Accounts: \mathbb{P} Account userAccount: User \leftrightarrow Account userTransactions: User \leftrightarrow \mathbb{P} Transaction
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State Users: \mathbb{P} User Accounts: \mathbb{P} Account userAccount: User \leftrightarrow Account userTransactions: User \leftrightarrow \mathbb{P} Transaction