<p>If a question A is a duplicate of a combination of two questions, what should I do? Should I flag it as duplicate of one of the two questions, and leave a comment? </p>

<p>The issue I have with comments is that that aren't meant to be kept forever: they may be deleted anytime, and users don't have access to their deleted comments. Even the source of non-deleted comments cannot be obtained.</p>

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<p>Example 1: <a href="https://stats.stackexchange.com/q/258811/12359">Neural networks: Differences between standard backpropagation, momentum and weight decay</a> is a duplicate of the combination of <a href="https://stats.stackexchange.com/q/29130/12359">Difference between neural net weight decay and learning rate</a> and <a href="https://stats.stackexchange.com/q/246896/12359">What is the intuition of momentum term in the neural network back propagation?</a>.</p>

<p>Example 2: <a href="https://stats.stackexchange.com/q/260219/12359">fine-tuned end-to-end meaning</a> = <a href="https://stats.stackexchange.com/q/255364/12359">Fine Tuning vs Joint Training vs Feature Extraction</a>  + <a href="https://stats.stackexchange.com/q/224118/12359">What does end to end mean in deep learning methods?</a></p>
