[plt-scheme] htdp section 17.7

[wooks .]

"3. This exercise separates those who have studied the design recipe  from 
those who haven't. Or those who will be great programmers from  those who 
will struggle.

Just do it. -- Matthias

P.S. Students who have never programmed before but follow the DR to  the dot 
tend to solve this problem in a couple of hours, max. They  are also usually 
girls but that's a coincidence."


...because girls are less likely than boys to have programmed before?