Consider the following program in Scheme: (    ( (lambda (x)           (lambda (y) (- x y) ) )     2 ) 3)   (1) In the interpreter, the expression is simplified to ( 3), where represents the closure after evaluating ( (lambda (x) (lambda (y) (- x y) ) ) 2 ) Write down the closure returned by the above expression.   (2) What is the evaluation result of ( 3). Give the expression and the environment in which it is evaluated.

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