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    To make a semiconductor wafer, you need to:
    1. Extract silicon from sand and purify it.
    2. Slice ingots into thin, disc-shaped wafers of uniform thickness using sharp diamond saw blades.
    3. Lap and polish the wafer surface.
    4. Create an oxide film on the wafer surface using oxidation.
    5. Draw circuit design on the wafer using photolithography.
    6. Remove unnecessary materials using etching.
    7. Deposit and ion implement (ion implantation).
    8. Create metal wiring.
    9. Use energy dispersive spectroscopy (EDS) to analyze the wafer.
    10. Package the wafer.
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