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From Wikipedia:
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A pie is a baked dish which is usually made of a pastry dough shell that covers or completely contains a filling of various sweet or savoury ingredients. Pies can be either "filled", where a dish is covered by pastry and the filling is placed on top of that, "top-crust," where the filling is placed in a dish and covered with a pastry/potato mash top before baking, or "two-crust," with the filling completely enclosed in the pastry shell. Pies can be a variety of sizes, ranging from bite-size to ones designed for multiple servings. |
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Urine (vulgar slang piss) is liquid waste product of the body secreted by the kidneys by a process of filtration from blood and excreted through the urethra. Cellular metabolism generates numerous waste compounds, many rich in nitrogen, that require elimination from the bloodstream. This waste is eventually expelled from the body in a process known as urination, the primary method for excreting water-soluble chemicals from the body. These chemicals can be detected and analysed by urinalysis. In pregnant women, amniotic fluid is closely related to urine, and can be analysed by amniocentesis.
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Pi vs Pie, 
