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There may be a little variation at the bottom of results for case sensitive variations but I doubt it would ever impact the SEO to the extent that we need to spend time considering it as part of the SEO process.
Search terms with large numbers of results returned can often vary a great deal in the number of results they display as having "returned". In reality, it doesn't matter if it's 30 million or 100 million results - if you are optimising for the term, then you are basically aiming for the top 100 and working up the way.
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