<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> I have to make this exercise : Design the function different. It consumes two (<a href="http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp2e-part1.html#%28counter._data-uni._%28exercise._struct9%29%29" pltdoc="x">representations of</a>) three-letter words and creates a word from the differences. For each position in the words, it uses the letter from the second word, if the two are the same; otherwise it uses the marker "*". Note: The problem statement mentions two different tasks: one concerning words and one concerning letters. This suggests that you design two functions. Im my opion I only need 1 function. I use a cond to check if the letters are the same and if print the letter otherwise print x . Can anyone give me a tip what the second function can be. Roelof </body> </html>