Hi,
1) How do you change the order of a list according to some property (e.g. decreasing order)?
2) How to evaluate the following expressions? (in the same environment)
(+ '1 '2)
'(+ 1 3)
'(a (b (c (d))))
(define x 3)
'x
(define a x)
'a
(define b 'x)
b
'b
(quote (quote a))
''a
Thanks, I'm really lost in evaluations!

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what language is this?

Umm Scheme of course. That's the language of the course.

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