3. You have the relations COURSES and TAUGHT-BY shown below.
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4. Show the content of stack SI and the value of variables x and y after the following algorithm segments is executed. (10%)
Stack(Sl); push(S 1, 5); push(Sl, 3); push(S 1, 2);
If (not empty(Sl)) pop(Sl, x);
If(not empty(S 1)) pop(Sl, y);
Push(Sl,6)
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