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I don't have the specific context about "Template:Str len/core" from the Wikimedia template system in the information you've provided. To write an accurate overview based only on provided context, I would need you to share the actual documentation or description of this template. Without that information, I cannot create an accurate, factual overview as you've requested.
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This is the documentation for {{str len/sandbox}} and its sub-template {{str len/core}}.