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Given a list of transactions, identify recurring transactions where the same company charged the same amount at regular intervals.
Source: LeetCode Discuss - Plaid Phone Interview
Find companies with at least 3 transactions of the exact same amount at consistent intervals (same number of days between each transaction).
Return a list of recurring patterns found, each containing the company name, amount, and interval in days.
Note: During the actual interview, the problem statement may be read aloud without visual aids. Take careful notes!
Related: See "Recurring Transactions Detection II" for a harder variant with tolerance-based matching.