The sense data theory of perception

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The sense data theory of perception

When taken in conjunction with empiricism, the sense data theory of perception threatens to give
rise to deep forms of skepticism. Explain why this is, and describe how Mitchell S. Greene attempts
to defeat the sense data theory of perception. Your discussion should address the following
considerations:
-What exactly is empiricism? What exactly is the sense data theory of perception?
-What about the conjunction of the two views leads Hume to conclude that we cannot know
the external world exists?
-Why exactly does Greene reject the sense data theory of perception?

Please elaborate on this.