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To parse buy and sell signals using the Gmail API, you will need to extract relevant information from the email content and determine whether the email indicates a buy or sell signal. One way to achieve this is by implementing a ____ algorithm in C++. This algorithm will analyze the email content and make a decision based on specific criteria or patterns. For example, you can check for keywords like "buy", "sell", "purchase", or "sell order" in the email text. By using a ____ algorithm, you can automate the process of parsing buy and sell signals from the emails you receive.