After solving a task, name the rule you actually used. Write it, sketch it, and teach it briefly to someone else. Then check whether the rule predicts success on a different problem. If it fails, refine it. Abstraction becomes reliable when prediction, not eloquence, judges understanding.
Instead of blocking similar exercises, mix categories to force discrimination. Pair look-alikes and ask what differs, then swap distant cases and ask what echoes. Interleaving feels harder, yet retention and transfer improve. Your mind learns to attend to structure, not comfort, revealing durable cues amid noisy variation.
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