Here is the matching of each sentence to the respective point, evidence, and analysis:
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Point: The writer presents crossword puzzles as both a form of entertainment and a mental exercise.
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Evidence: The writer says that crossword puzzles can help to keep your memory "razor sharp."
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Analysis: By using the metaphor "razor sharp," the writer creates an image of a sharp blade, which emphasises the idea that by doing puzzles regularly, your memory will become both a powerful instrument at your disposal and as finely tuned as a razor blade.