On May 12, 2012, at 2:21 PM, saad bashir wrote:

>  I did not understand how to use string-ith.


What part of the description did you not understand given that you had worked 
thru the Prologue and seen things such as 

 > (+ 1 2)
 3
 > (place-image cat x0 y0 scene)

-- Matthias

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