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Trying to clarify the question:
(Please correct if the question you want to ask is different.)
If that's your question, I think the Sage Notebook server might have some limits to the amount of memory each user can use, and some timeout on how long computations can take before they are stopped. You could try to use SageMathCloud at cloud.sagemath.com, or to find a Sage Notebook server with more generous usage limits.
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