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		.. (לתיקייה המכילה)

Which Pascal Compiler do i have to use for the pascal part?
As mentioned in the first tutorial: Free Pascal 2.4
קישור: Link: Ссылка: وصلة:	http://sourceforge.net/projects/freepascal/files/Win32/2.4.0/

I get a compilation error "can't read or write variables of this type" due to the statement "read(order_by);"

You are probably using a compiler version prior to 2.4.0 .

In question #2: Do I have to derive all of these statements: 1) x:=x+y; 2) y:=x-y; 3) x:=x-y; 4) read(a,b); 5) switch(a,b); 6) writeln(a,b);

No. Derive only statement #4. The other statements can be leaves

In question #2b: there are actually 2 errors, not 1!

There was a typo in this question. Please check again the exercise for the corrected version.