You could also have added the following questions, which discuss subroutines and scoping as well:

4) What happens if you move line 7 to line 12?
5) After question 4, what happens when you do the following (in order)
+ to line 12?  why?
    a) Remove the parentheses
    b) Remove the semi-colon
    c) Precede line 12 with an ampersand (&)
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jynx

PS please forgive my poor question asking ability...