[plt-scheme] HtDP newbie question, 12.4.2

From: Cooke Kelsey (cookekelsey at yahoo.com)
Date: Fri Mar 28 10:53:12 EDT 2008

(append (list 'A) (list 'X 'T)) = (list 'A 'X 'T)

Matthias Felleisen <matthias at ccs.neu.edu> wrote:    

  Here is a definition of 'adding in the missing element': 

  * If a list X misses the symbol 'A (at the front), how do you get a list that has the 'A and all of X? 

  * X = (list 'X 'T) and 'A --> I want (list 'A 'X 'T). How do I do that? 

  -- Matthias

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