Match the items in the first column to their functions in the second column
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P. Sprue
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1. Regulates flow of molten metal into mould cavity
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Q. Riser
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2. Feeds molten metal from pouring basin to gate
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R. Gate
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3. Acts as a reservoir for molten metal
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S. Pouring basin
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4. Supplies molten metal to compensate for liquid shrinkage
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