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Could you please elaborate on the concept of "the enemy of flow"? I'm particularly interested in understanding what factors or conditions tend to disrupt or hinder the state of flow, which is often described as a highly focused and immersive mental state that is conducive to creativity and productivity. Could you provide some examples of common obstacles that individuals might encounter while trying to achieve a state of flow, and perhaps also suggest some strategies for overcoming these challenges? I'm keen to learn more about how to cultivate and maintain flow in various contexts, such as work, learning, or even daily life activities.