Print out slides 8, 10, 11, and 17 from 23-RelationalAlgebra.ppt. These pages are about the relational algebra operations $\rho$ and $\cup$, $\sigma$, $\pi$, and $|x|$ respectively. For each page, annotate the examples either (1) by writing in your own word how the resulting relation(s) are obtained from the given relation(s), or (2) if you can’t explain an example, by writing a question whose answer would help you understand the operation illustrated in the example.

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