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Option 1: "new connections"
Explanation: The text discusses how the brain encodes memories by making new connections between neurons. This directly supports the idea that 'new connections' is the correct completion for the sentence, as it aligns with the main theme of memory formation during sleep.
Option 2: "new words and their translations"
Explanation: This option introduces a specific context of language learning that is not mentioned in the text. The text focuses on the general process of memory formation rather than specific vocabulary acquisition, making this option irrelevant.
Option 3: "memories"
Explanation: While 'memories' is related to the topic, it does not fit the context of the sentence as well as 'new connections.' The text emphasizes the process of creating connections in the brain rather than simply referring to memories themselves, which makes this option too broad and not specific enough.
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